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Preprint ARTICLE | doi:10.20944/preprints202207.0134.v1

Effect of Various Parameter on Perihelion Shift and Deflection Angle in Reissner-Nordstrom Spacetime

Surajit Mandal

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: perihelion shift; bending of light; Reissner-Nordstrom Black Hole

Online: 8 July 2022 (06:44:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201905.0364.v1

Laser-Plasma and Self-Absorption Measurements with Applications to Analysis of Atomic and Molecular Stellar Astrophysics Spectra

Christian Parigger, Christopher M Helstern, Ghaneshwar Gautam

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: atomic and molecular spectroscopy; time-resolved spectroscopy; laser plasma; laser-induced optical breakdown; stellar astrophysics spectra; white dwarf stars; hydrogen; carbon Swan spectra

Online: 30 May 2019 (08:53:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201905.0371.v1

Thermodynamic, non-extensive, or turbulent quasi equilibrium for space plasma environment

Peter Yoon

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: non-extensive entropic principle; plasma turbulence; quasi equilibrium

Online: 31 May 2019 (06:12:02 CEST)

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Working Paper ARTICLE

Constraints on $\sigma_8$ Degeneracies from Linear Nash-Greene Perturbations in Subhorizon Scale

Abraao Capistrano

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: modified Friedman equations; modified gravity; dark energy

Online: 19 June 2020 (08:38:18 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201912.0125.v1

Dark Energy Stars with Quadratic Equation of State

Manuel Malaver, Hamed Kasmaei

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark energy; stellar configurations; anisotropic fluid distribution; quadratic equation of state; Einstein-Maxwell field equations; metric coefficients

Online: 10 December 2019 (04:42:44 CET)

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Preprint ARTICLE | doi:10.20944/preprints201808.0544.v1

Accelerated Frames and Galactic Rotation Curves

Sergio C. Ulhoa, Fernando L. Carneiro

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: accelerated frames; galactic rotation curve; dark matter

Online: 31 August 2018 (10:00:39 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0197.v9

Space Theory

S. Chen

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: space; gravitation

Online: 26 March 2024 (14:12:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints202107.0408.v1

Analysis of Tidal Accelerations in the Solar System and in Extrasolar Planetary Systems

Klaus Paschek, Arthur Roßmann, Michael Hausmann, Georg Hildenbrand

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: tidal forces, numeric simulation, acceleration vectors, multi-planetary system, extrasolar planets/planet systems

Online: 19 July 2021 (11:50:17 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201812.0054.v3

The Vacuum Polarization Paradox and Its Solution

Engel Roza

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: quantum gravity; vacuum polarization; gravitational dipole; Majorana particle

Online: 5 March 2019 (11:14:31 CET)

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Preprint ARTICLE | doi:10.20944/preprints201804.0212.v1

Planets, Planetary Nebulae, and Intermediate Luminosity Optical Transients (ILOTs)

Noam Soker

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: planetary nebulae: general; stars: AGB and post-AGB; stars: variables: general; stars: winds, outflows

Online: 16 April 2018 (14:05:31 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0422.v1

VALD: The Meeting Point of Data Producers and Data Users

Tatiana Ryabchikova, Yury Pakhomov, Nikolai Piskunov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: stellar spectra; atomic and molecular data; databases

Online: 26 June 2018 (13:08:52 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201903.0284.v1

The Effect of the Brane-Dicke Coupling Parameter on Weak Gravitational Lensing by Wormholes and Naked Singularities

Wajiha Javed, Rimsha Babar, Ali Övgün

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Deflection of light, Gravitational lensing, Wormhole, Gauss-Bonnet theorem, Brane-Dicke gravity

Online: 29 March 2019 (12:18:07 CET)

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Preprint ARTICLE | doi:10.20944/preprints201904.0105.v1

Weighing Cosmological Models with SNe Ia and GRB Redshift Data

Rajendra P. Gupta

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: galaxies; supernovae; GRB; distances and redshifts; cosmic microwave background radiation; distance scale; cosmology theory; cosmological constant; Hubble constant; general relativity; TMT

Online: 9 April 2019 (11:38:12 CEST)

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Many models have been proposed to explain the intergalactic redshift using different observational data and different criteria for the goodness-of-fit of a model to the data. The purpose of this paper is to examine several suggested models using the same supernovae Ia data and gamma-ray burst (GRB) data with the same goodness-of-fit criterion and weigh them against the standard

Λ

CDM model. We have used the redshift – distance modulus (

z - μ

) data for 580 supernovae Ia with

0.015 \leq z \leq 1.414

to determine the parameters for each model, and then use these model parameter to see how each model fits the sole SNe Ia data at

z = 1.914

and the GRB data up to

z = 8.1

. For the goodness-of-fit criterion, we have used the chi-square probability determined from the weighted least square sum through non-linear regression fit to the data relative to the values predicted by each model. We find that the standard ΛCDM model gives the highest chi-square probability in all cases albeit with a rather small margin over the next best model - the recently introduced nonadiabatic Einstein de Sitter model. We have made (

z - μ

) projections up to

z = 1096

for the best four models. The best two models differ in

μ

only by 0.328 at

z = 1096

, a tiny fraction of the measurement errors that are in the high redshift datasets.

Preprint CONCEPT PAPER | doi:10.20944/preprints202201.0168.v1

Dark Matter - Are They Insulators to Electromagnetic Radiation?

Sayan Bag, Arijit Bag

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Dark matter; Bose-Einstein Condensation; Electromagnetic insulator

Online: 12 January 2022 (13:45:21 CET)

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Preprint ARTICLE | doi:10.20944/preprints201811.0628.v1

Some String Cosmological Models in Bianchi Type III Space-Time with Magnetic Field and Vacuum Energy Density

Raj Bali, Subhash Bola

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: String, Cosmological, Bianchi Type III, Magnetic Field, Vacuum Energy Density.

Online: 30 November 2018 (10:13:50 CET)

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Preprint ARTICLE | doi:10.20944/preprints201812.0002.v2

Reasons in favor of a Hubble-Lemaître-Slipher's (HLS) Law

Emilio Elizalde

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: universe expansion; cosmological distances; cosmological velocities; the concept of physical law

Online: 4 January 2019 (11:21:55 CET)

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Working Paper ARTICLE

Cold Dark Matter: A Gluonic Bose-Einstein Condensate in Anti-de Sitter Space Time

Gilles Cohen-Tannoudji, Jean-Pierre Gazeau

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmological constant; dark matter; dark energy; de Sitter; Anti de Sitter; quark gluon plasma; gluon Bose Einstein condensate

Online: 27 September 2021 (11:54:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202108.0159.v2

On the Vacuum Energy of the Universe at the Galaxy Level, the Cosmological Level and the Quantum Level

Engel Roza

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Milgrom’s acceleration constant; Bekenstein-Hawking entropy; gravitational dipole; dark matter

Online: 23 May 2023 (08:04:24 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201907.0133.v1

A Theory of Inertia Based on Mach's Principle

Volkmar Putz

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: inertia; Mach's principle; history of physics

Online: 9 July 2019 (14:21:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201810.0084.v1

Combining Faraday Tomography and Wavelet Analysis

Dmitry Sokoloff, Rainer Beck, Anton Chupin, Peter Frick, George Heald, Rodion Stepanov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: galactic magnetic field; RM-synthesis; Faraday depolarization; wavelet analysis

Online: 4 October 2018 (15:27:30 CEST)

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Preprint HYPOTHESIS | doi:10.20944/preprints202109.0200.v2

An Alternative Explanation of the Orbital Expansion of Titan and Other Bodies in the Solar System

Michal Křížek, Vesselin G. Gueorguiev, André Maeder

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: local Hubble expansion; Solar system; Titan; laws of conservation of energy and angular momentum

Online: 13 January 2022 (12:58:55 CET)

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Preprint ARTICLE | doi:10.20944/preprints201904.0121.v1

Astrometric Solar-System Anomalies and Evolutionary Physical Constants

Rajendra P. Gupta

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: pioneer anomaly; AU anomaly; astronomical unit; varying physical constant; VSL; LLR; moon eccentricity

Online: 10 April 2019 (08:38:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202201.0203.v1

Occams Razor-No Dark Matter in Galactic Halos

Holger Döring

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Dark matter; no dark matter; halo-curves; gravity-forces; galactic core; third Kepler-law; centripetal force; stellar halo- velocity

Online: 14 January 2022 (11:20:04 CET)

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Preprint ARTICLE | doi:10.20944/preprints201810.0637.v1

Untangling Cosmic Magnetic Fields: Faraday Tomography at MetreWavelengths with LOFAR

Shane O'Sullivan, Marcus Brüggen, Cameron Van Eck, Martin Hardcastle, Marijke Haverkorn, Timothy Shimwell, Cyril Tasse, Valentina Vacca, Cathy Horellou, George Heald

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: magnetic fields; Faraday tomography; large-scale structure; AGN; Milky Way

Online: 26 October 2018 (15:35:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201907.0241.v2

Testing RNN-LSTM Forecasting with Simulated Time-Series : Exploring Univariate Sensitivity

Nachiketa Chakraborty

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: recurrent neural networks; LSTM; lightcurves; simulation; variability

Online: 31 August 2023 (10:08:17 CEST)

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With an explosion of data in the nearly every domain, from physical and environmental sciences to econometrics and even social science, we have entered a golden era of time-domain data science. In addition to ever increasing data volumes and varieties of time-series, there's a plethora of techniques available to analyses them. Unsurprisingly, machine learning approaches are very popular. In environmental sciences (ranging from climate studies to space weather/solar physics), machine learning (ML )and deep learning (DL) approaches complement the traditional data assimilation approaches. In solar and astrophysics, multiwavelength time-series or lightcurves along with observations of other messengers like gravitational waves provide a treasure trove of time-domain data for ML/DL approaches for modeling and forecasting. In this regard, deep learning algorithms such as recurrent neural networks (RNNs) should prove extremely powerful for forecasting as it has in several other domains. Such methods agnostic of the physics can only predict transient flares that are represented in the original distribution trained on (eg. coloured noise fluctuations) and not special, isolated episodes (eg. a one-off outburst like a major coronal mass ejection) potentially distinguishing them. Therefore it is vital to test robustness of these techniques ; here we attempt to make a small contribution to this by exploring sensitivity of RNNs with some rudimentary experiments. We test the performance of a very successful class of RNNs, the Long Short Term Memory (LSTM) algorithms with simulated lightcurves. As an example, we focus on univariate forecasting of time-series (or lightcurves) characteristic certain variable astrophysical objects (eg. active galactic nuclei or AGN). Specifically, we explore the sensitivity of training and test losses to key parameters of the LSTM network and data characteristics namely gaps and complexity measured in terms of number of Fourier components. We find that typically, the performances of LSTMs are better for pink or flicker noise type sources. The key parameters on which performance is dependent are batch size for LSTM and the gap percentage of the lightcurves. While a batch size of $10-30$ seems optimal, the most optimal test and train losses are under $10 \%$ of missing data for both periodic and random gaps in pink noise. The performance is far worse for red noise. This compromises detectability of transients. Thus, we show that generative models (time-series simulations) are excellent guides for use of RNN-LSTMs in building forecasting systems

Preprint ARTICLE | doi:10.20944/preprints201904.0064.v1

Varying Physical Constants, Astrometric Anomalies, Redshift and Hubble Units

Rajendra P. Gupta

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Astroparticle physics; astrometric anomaly; supernovae redshift; cosmology theory; variable physical constants; VSL

Online: 5 April 2019 (12:07:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201807.0337.v2

No Need for Dark-Matter, Dark-Energy or Inflation, Once Ordinary Matter is Properly Represented?

Yehonatan Knoll

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark matter; dark energy; inflation; scale covariance; foundations of general relativity

Online: 25 July 2018 (10:49:18 CEST)

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Preprint REVIEW | doi:10.20944/preprints202104.0156.v2

White Hole Cosmology - One Best Alternative for Standard Cosmology

U V Satya Seshavatharam, S Lakshminarayana

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: new definition of cosmic red shift; Planck mass; quantum model of cosmology; light speed expansion; galactic dark matter; flat rotation speed; cosmic rotation; galactic acceleration

Online: 12 July 2021 (13:48:52 CEST)

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Working Paper ARTICLE

Information Energy Mimics Ʌ and CDM

Michael Paul Gough

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark energy; dark matter; ʌcdm model

Online: 28 February 2020 (13:28:05 CET)

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Preprint ARTICLE | doi:10.20944/preprints201904.0119.v1

Evolutionary Physical Constants in Einstein's Field Equations and the Redshift

Rajendra P. Gupta

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmology theory; cosmological parameters; galaxies; distances and redshifts; variable physical constants; VSL

Online: 10 April 2019 (08:25:53 CEST)

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Preprint REVIEW | doi:10.20944/preprints202110.0402.v1

Jim Henry, Mesut Yurukcu, George Nnanna

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Universe; galaxies; Milky Way Galaxy; spiral galaxies; hurricanes; pattern.

Online: 27 October 2021 (11:49:50 CEST)

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Preprint REVIEW | doi:10.20944/preprints202106.0597.v1

Relativistic Cosmology with an Introduction to Inflation

Muhammad Zahid Mughal, Iftikhar Ahmad, Juan Luis GARCÍA GUIRAO

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: spacetime; relativistic cosmology; big bang model; inflation

Online: 24 June 2021 (09:33:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0378.v1

Simulations and Modeling of Intermediate Luminosity Optical Transients and Supernova Impostors

Amit Kashi

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: stellar evolution; late stage stellar evolution; binarity; transients; planetary nebulae

Online: 25 June 2018 (10:30:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201903.0112.v1

Lukewarm Blackhole in a Nash-Greene Framework

Abraão J. S. Capistrano

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: extra-dimensions; gravity; Cosmological constant; Black-holes

Online: 11 March 2019 (07:49:26 CET)

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Preprint ARTICLE | doi:10.20944/preprints202109.0086.v2

Primordial Planets with an Admixture of Dark Matter Particles and Baryonic Matter

OV Kiren, Arun Kenath, Chandra Sivaram

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Primordial planets; Dark Matter; DM-baryonic admixture; Early Universe

Online: 28 June 2023 (15:32:43 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202109.0140.v1

Hubble Expansion as an Einstein Curvature

John Herbert Marr

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmology; theory; cosmology; observations; Hubble flow; dark energy; dark matter

Online: 8 September 2021 (11:08:46 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201810.0407.v3

On the Eternal Role of Planck Scale in Machian Cosmology

Satya Seshavatharam U.V, S. Lakshminarayana

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Planck scale; Mach’s relation; quantum cosmology; critical density; ordinary matter; dark matter; thermal redshift; expansion velocity; rotational kinetic energy; dark energy; Hubble’s law

Online: 2 November 2018 (02:30:57 CET)

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With reference to Planck scale, Mach's relation and by introducing two new parameters Gamma and Beta, right from the beginning of Planck scale, we make an attempt to estimate ordinary matter density ratio, dark matter density ratio, mass, radius, temperature, age and expansion velocity (from and about the Planck mass in all directions). In analogy with currently believed cosmic acceleration, with a decreasing trend of total matter density ratio, cosmic expansion velocity can be shown to be increasing. By considering

H_{0} ≅ 70

km/sec/Mpc, estimated current cosmic mass, radius, total matter density, expansion velocity, temperature and age are:

4.3352 \times 10^{53} kg,

3.207 \times 10^{26} m,

3.138 \times 10^{- 27} kg {. m}^{- 3},

2.43 c,

2.721 K

and

19.78 Billion years

respectively. Point to be noted is that, with reference to Planck scale, cosmic temperature seems to be redshifted by a factor

{(Z_{T})}_{t} ≅ \sqrt{1 + \ln (H_{p l} / H_{t})} - 1

where

(H_{p l}, H_{t})

represent Planck scale and time dependent Hubble parameters respectively. As a peculiar case, considering the equality of current Hubble parameter and current angular velocity, current cosmic rotational kinetic energy can be estimated to be 0.667 times the current critical energy. It needs further study.

Preprint ARTICLE | doi:10.20944/preprints202103.0741.v2

A New Cosmological Model Based on Quantization of the Zero-point Field

Biswaranjan Dikshit

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Cosmological constant problem; Cosmic coincidence problem; Energy conservation; Dark energy; Flatness problem; Horizon problem; Multiverse

Online: 20 September 2021 (15:14:45 CEST)

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Working Paper REVIEW

Photon-photon Interactions and the Opacity of the Universe in Gamma-Rays

Alberto Franceschini

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: High energy astrophysics; Background radiation; Photon-photon interaction; Pair production

Online: 30 March 2021 (13:10:22 CEST)

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Preprint HYPOTHESIS | doi:10.20944/preprints202106.0421.v2

ANYONS - One Key to Unlock Gravitational-Electromagnetic Union, the Topological Universe, Space-time Travel, Future Computers, Dark Matter/Dark Energy

Rodney Bartlett

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Anyon, Gravitational-Electromagnetic Unification, Topological Universe, Intergalactic Travel, Future Computers, Dark Matter/Dark Energy

Online: 28 June 2021 (16:26:23 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202102.0052.v2

Information Dark Energy can resolve Hubble tension and is falsifiable by experiment.

Michael Paul Gough

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Dark Energy; LambdaCDM; Cosmological Constant; Hubble Tension

Online: 7 February 2022 (16:10:09 CET)

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Preprint ARTICLE | doi:10.20944/preprints201810.0713.v1

A Quantum Mechanical Relationship between Milgrom’s Acceleration Constant and the Bekenstein-Hawking Entropy Expression

Engel Roza

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Milgrom’s acceleration constant; Bekenstein-Hawking entropy; gravitational dipole; dark matter

Online: 30 October 2018 (08:34:03 CET)

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Preprint ARTICLE | doi:10.20944/preprints202103.0560.v1

New Evidence of the Azimuthal Alignment of Quasars Spin Vector in the LQG U1.28, U1.27, U1.11, Cosmologically Explained

Reinoud Jan Slagter

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: quasar groups; alignment spin vectors; host galaxy; cosmic strings; symmetry breaking; scalar gauge field

Online: 23 March 2021 (09:54:21 CET)

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Preprint ARTICLE | doi:10.20944/preprints202108.0538.v1

Can Hubble Tension Be Eased by Invoking a Finite Range for Gravity?

Louise Rebecca, Arun Kenath, C Sivaram

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Hubble constant; Hubble tension; early Universe; modified gravity; finite gravity

Online: 30 August 2021 (10:25:23 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202110.0147.v1

Jeans Instability, Jeans Entropy and the Entropy Origin of Gravity

Edward Bormashenko

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: gravity; entropic force; Jeans instability; isothermal self-gravitating cloud.

Online: 8 October 2021 (16:42:50 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202101.0146.v1

Hamiltonian Formalism of Bianchi Type I Model for Fluid Bulk and Shearing Viscosity

Shouvik Sadhukhan, Alokananda Kar

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: General theory of relativity; Bianchi type 1; Hamiltonian formalism; bulk viscosity; cosmology; Fluid dynamics; Isotropic and Anisotropic cosmology; shearing viscosity

Online: 8 January 2021 (11:21:41 CET)

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Preprint REVIEW | doi:10.20944/preprints201811.0374.v2

Relativistic Jet Simulations of the Weibel Instability in the Slab Model to Cylindrical Jets with Helical Magnetic Fields

Ken-Ichi Nishikawa, Yosuke Mizuno, Jose l. Gomez, Ioana Dutan, Athina Meli, Jacek Niemiec, Oleh Kobzar, Martin Pohl, Helen Sol, Nicholas MacDonald, Dieter H. Hartmann

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: particle-in-cell simulations; relativistic jets; the Weibel instability; kink-like instability; mushroom instability; global jets; helical magnetic fields; recollimation shocks

Online: 25 December 2018 (09:01:18 CET)

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Preprint REVIEW | doi:10.20944/preprints202109.0508.v2

How Fast Is the Distance between Earth and the Sun Changing in the Solar System?

Jim Henry, Mesut Yurukcu, George Nnanna

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Solar System; Earth; Sun; Expansion; Universe

Online: 12 October 2021 (14:27:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202201.0238.v1

New Derivation of Redshift Distance Without Using Power Expansions. II. Additional Redshift Distances, Analyzing the Data of More Quasars, of Some SNIa, of the One Black Hole in Galaxy M87 as Well as a Newer Estimation of H₀

Steffen Haase

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: relativistic astrophysics; theoretical and observational cosmology; redshift; Hubble parameter; quasar; black hole; SNIa; galaxy; M87

Online: 17 January 2022 (15:28:25 CET)

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Working Paper ARTICLE

Subhorizon Linear Nash Perturbations with Joint Analysis of Cosmic Growth and Expansion with Constrains on H(z) and the Deceleration Parameter q(z)

Abraao Capistrano, Paola T. Z. Seidel, Hemerson R. Duarte

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: modified Friedman equations; modified gravity; dark energy

Online: 18 June 2020 (09:25:41 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202009.0452.v1

Theoretical Value of Hubble’s constant is a Salient Feature of Experimental Results- New Insight in to Origin of Universe

Siva Prasad Kodukula

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Hubble’s constant ‘H’; space time; velocity of light; parsec; expanding universe; Siva’s constant ‘K’

Online: 19 September 2020 (08:31:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202308.1508.v1

The Extremal Universe Exact Solution from Einstein’s Field Equation gives the Cosmological Constant Directly

Espen Gaarder Haug

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: General relativity theory; cosmological constant extremal solution; Reissner-Nordström; Kerr; Kerr-Newman

Online: 22 August 2023 (08:57:37 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0424.v4

A Scale-Invariant, Machian Theory of Gravitation and Electrodynamics Unified

Ram Gopal Vishwakarma

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Gravitation - Fundamental Problems and General Formalism; Electrodynamics; Scale Invariance; Mach Principle; Dark Energy

Online: 3 October 2018 (15:35:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202005.0233.v2

Supernova Plasma Effects on Extragalactic Light Fields

Paul Marko

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Supernova; Plasma; Gravitational Lens; Einstein Cross; Hubble Constant; Hubble Tension

Online: 24 May 2022 (13:24:51 CEST)

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Preprint REVIEW | doi:10.20944/preprints202005.0523.v1

Is There Water Ice in the Lunar Polar Craters?

Tianxi Sun

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: water ice; hydroxyl radicals; methanol; hydroxyl groups; spectral identity; confusion

Online: 31 May 2020 (21:58:06 CEST)

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Working Paper REVIEW

Rotating Disk Galaxies without Dark Matter Based on Scientific Reasoning

James Feng

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: disk galaxies; galactic rotation; Newtonian dynamics; rotation curve; dark matter; mass-to-light ratio

Online: 13 November 2019 (02:37:48 CET)

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Working Paper ARTICLE

Our Peculiar Motion Inferred from Number Counts of Mid Infra Red AGNs and the Discordance Seen with the Cosmological Principle

Ashok K. Singal

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: active galactic nuclei surveys; cosmic background radiation; large-scale structure of universe; solar system peculiar motion; cosmological principle

Online: 22 March 2021 (11:58:59 CET)

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According to the Cosmological Principle the Universe is isotropic and no preferred direction would be seen by an observer that might be stationary with respect to the expanding cosmic fluid. However, because of observer’s partaking in the solar system peculiar motion, there would appear in some of the observed properties of the Cosmos a dipole anisotropy, which could in turn be exploited to determine the peculiar motion of the solar system. The dipole anisotropy in the Cosmic Microwave Background Radiation (CMBR) has given a peculiar velocity vector 370 km s−1 along l=264∘,b=48∘. However, some other dipoles, for instance, from the number counts, sky brightness or redshift distributions in large samples of distant Active Galactic Nuclei (AGNs), have yielded values of the peculiar velocity many times larger than that from the CMBR, though surprisingly, in all cases the directions agreed with the CMBR dipole. Here we determine our peculiar motion from a sample of 0.28 million AGNs, selected from the Mid Infra Red Active Galactic Nuclei (MIRAGN) sample comprising more than a million sources. From this, we find a peculiar velocity, which is more than four times the CMBR value, although the direction seems to be within ∼2σ of the CMBR dipole. A genuine value of the solar peculiar velocity should be the same irrespective of the data or the technique employed to estimate it. Therefore, such discordant dipole amplitudes, might mean that the explanation for these dipoles, including that of the CMBR, might in fact be something else. But, the observed fact that the direction in all cases, is the same, though obtained from completely independent surveys using different instruments and techniques, by different sets of people employing different computing routines, might nonetheless indicate that these dipoles are not merely due to some systematics, otherwise why would they all be pointing along the same direction. It might instead suggest a preferred direction in the Universe, implying a genuine anisotropy, which would violate the Cosmological Principle, the core of the modern cosmology.

Preprint ARTICLE | doi:10.20944/preprints201807.0149.v1

Binary Interactions, High-Speed Outflows and Dusty Disks during the Agb-to-Pn Transition

Raghvendra Sahai

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: planetary nebulae; AGB & post-AGB stars; binarity; accretion disks; jets; mass-loss; circumstellar matter; (sub)millimeter interferometry; ultraviolet radiation; X-rays

Online: 9 July 2018 (13:58:51 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202201.0301.v9

Th Hyperboloidal Universe

Christopher Laforet

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Cosmology; Black holes; Dark Energy; Schwarzschild metric

Online: 19 July 2022 (10:32:16 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202105.0110.v1

Lensing Effects in Retarded Gravity

Asher Yahalom

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: spacetime symmetry; relativity of spacetime; retardation; lensing

Online: 6 May 2021 (15:28:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0388.v1

Different Explanations for the Cosmic Microwave Background Radiation

Ting-Hang Pei

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmic microwave background; cosmic infrared background; cosmic background detector; Planck Surveyor; Baryon Oscillation Spectroscopic Survey

Online: 26 October 2021 (13:53:29 CEST)

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Preprint REVIEW | doi:10.20944/preprints202201.0347.v1

Statistical Tools for Imaging Atmospheric Cherenkov Telescopes

Giacomo D’Amico

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Statistical analysis; gamma-rays; IACTs; likelihood; Bayes.

Online: 24 January 2022 (11:30:19 CET)

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Preprint HYPOTHESIS | doi:10.20944/preprints202105.0239.v2

Hypothesis of Quantum Gravity - Resulting from a Static, Topological Universe Resulting from the Positives and Negatives of the Steady State and Big Bang Theories

Rodney Bartlett

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Gravitation, Electromagnetic-gravitational union, Dark energy, Dark matter, Cosmology, Geometry, Topology

Online: 24 May 2021 (11:58:24 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201810.0727.v1

Is there a Depolarization Horizon?

A. S. Hill

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Techniques: radio polarization; ISM: turbulence; ISM: magnetic fields

Online: 30 October 2018 (14:31:00 CET)

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Preprint HYPOTHESIS | doi:10.20944/preprints202105.0437.v1

The Topological Universe’s Topological Materials

Rodney Bartlett

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Binary digits, Mobius strips, Figure-8 Klein bottles, Dark matter, Dark energy, Topological insulators, Topological superconductors, Topological universe, Weyl fermion, Majorana fermion, Vector-tensor-scalar geometry, Higgs-like body/consciousness

Online: 19 May 2021 (08:23:47 CEST)

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Working Paper ARTICLE

On the Role of Cosmic Mass in Understanding the Relationships among Galactic Dark Matter, Visible Matter and Flat Rotation Speeds

U.V.S. Seshavatharam, S. Lakshminarayana

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Planck mass; Mach’s principle; distance cosmic mass; galactic visible mass; galactic dark mass; galactic flat rotation speeds; time dependent reference mass;

Online: 9 August 2021 (09:16:42 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201809.0283.v1

Detection of Periodic Radio Signal from the Blazar J1043+2408

Gopal Bhatta

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: supermassive black holes: non-thermal radiation; active galactic nuclei: BL lacertae objects: individual: J1043+2408; galaxies: jets; method: time series analysis

Online: 17 September 2018 (06:00:08 CEST)

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Preprint BRIEF REPORT | doi:10.20944/preprints202303.0384.v2

A Newtonian Approach to General Black Holes

Alain Haraux

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: gravitation; velocity of light; photons; escape velocity; black holes

Online: 28 March 2023 (02:39:58 CEST)

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Preprint HYPOTHESIS | doi:10.20944/preprints202009.0233.v1

Gravitational Waves Carry Information about the Infalling Matter out of Black Holes: a Resolution of the Black Hole Information Paradox

Xueyi Tian

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: black holes; information paradox; Hawking radiation; information loss; gravitational waves; entropy

Online: 10 September 2020 (10:04:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201811.0208.v1

Verification of photometric parallaxes with Gaia DR2 data

Oleg Malkov, Sergey Karpov, Dana Kovaleva, Sergey Sichevsky, Dmitry Chulkov, Olga Dluzhnevskaya, Alexey Kniazev, Areg Mickaelian, Alexey Mironov, Jayant Murthy, Alexey Sytov, Gang Zhao, Aleksandr Zhukov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: parallax; photometry; interstellar extinction; surveys; Gaia

Online: 8 November 2018 (11:08:30 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0330.v1

First Observations of SN 1604 (Kepler's Supernova)

Alessandro De Angelis, selenia broccio

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Supernova remnants; Stellar evolution; High-energy astrophysics

Online: 22 October 2021 (12:11:22 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202203.0280.v1

Galaxies in Timeline Order

Sándor Buglyó

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Dark matter; dark energy; galaxy evolution; gamma rays

Online: 21 March 2022 (09:06:08 CET)

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Preprint ARTICLE | doi:10.20944/preprints202205.0262.v1

The Dark Energy Sector of Generalised Proper Time

David Jackson

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Dark energy; dark matter; Standard Model; unification; proper time; extra dimensions

Online: 19 May 2022 (13:38:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202006.0239.v1

Non-Detection of Dark Matter Particles: A Case for Alternate Theories of Gravity

Arun Kenath, C Sivaram, Avijeet Prasad, Louise Rebecca

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark matter; dark energy; alternate theories of gravity; MOND; Hubble tension

Online: 19 June 2020 (10:57:02 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201909.0196.v3

Linearized Stability of Bardeen de-Sitter Thin-Shell Wormholes

Hassan Alshal

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Bardeen; black hole; de-Sitter; thin-shell; wormhole

Online: 7 October 2019 (12:35:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201809.0147.v1

Constraints on Lorentz Invariance Violation From Optical Polarimetry of Astrophysical Objects

Fabian Kislat

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Lorentz invariance; Standard-Model extension; polarization; Active Galactic Nuclei; Gamma-ray Bursts

Online: 9 September 2018 (09:04:03 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202311.1978.v1

Entropy of Black Holes and an Oscillating Universe

Nick Gorkavyi

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: entropy; black holes; oscillating Universe

Online: 30 November 2023 (11:35:46 CET)

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Preprint REVIEW | doi:10.20944/preprints202109.0519.v1

Review on Dark Matter Searches with Neutrino Telescopes

Juan de Dios Zornoza

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark matter; neutrino telescopes; icecube; antares; km3net; superk

Online: 30 September 2021 (14:15:58 CEST)

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Working Paper ARTICLE

Brightest Point in Accretion Disk and Black Hole Spin: Implication to the Image of Black Hole M87*

Vyacheslav I. Dokuchaev, Natalia O. Nazarova

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: General Relativity, gravity, black hole, black hole shadow

Online: 18 June 2019 (10:31:12 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201810.0115.v2

Science Pipelines for the Square Kilometre Array

Jamie Farnes, Ben Mort, Fred Dulwich, Stef Salvini, Wes Armour

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: radio astronomy; interferometry; square kilometre array; big data; faraday tomography

Online: 21 November 2018 (07:19:33 CET)

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Preprint ARTICLE | doi:10.20944/preprints202204.0193.v1

Holographic Dendrogramic Theory: Predictability of Relational Dynamics of the Event Universe and the Emergence of Time Arrow

Oded Shor, Felix Benninger, Andrei Khrennikov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: event-universe; dendrograms; hierarchic relational representation; dendrogramic dynamics; shape dynamics; stability of event-universe; arrow of time

Online: 21 April 2022 (07:56:21 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0192.v1

Interpretation of Time-Varying Radio Emissions of SgrＡ* Observed by 1.3 Millimeter-Wavelength VLBI ---with Parameters of The Super-Massive Black Hole Binary at SgrＡ* Based on Decameter Radio Wave Pulse Observations

Hiroshi Oya

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: galaxy center; supermassive black hole; black hole binary; VLBI; submillimeter radio wave; decameter radio wave; event horizon

Online: 13 May 2022 (11:01:08 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202010.0298.v1

Cosmic Ray Extremely Distributed Observatory

Piotr Homola, Dmitriy Beznosko, Gopal Bhatta, Łukasz Bibrzycki, Łukasz Bratek, Michalina Borczyńska, Nikolay M. Budnev, Dariusz Burakowski, David Edwin Alvarez-Castillo, Kevin Almeida Cheminant, Aleksander Ćwikła, Punsiri Dam-o, Niraj Dhital, Alan Duffy, Piotr Głownia, Krzysztof Gorzkiewicz, Dariusz Góra, Alok C. Gupta, Zuzana Hlávková, Martin Homola, Joanna Jałocha, Robert Kamiński, Michał Karbowiak, Marcin Kasztelan, Renata Kierepko, Marek Knap, Péter Kovács, Szymon Kuliński, Bartosz Łozowski, Marek Magryś, Mikhail V. Medvedev, Justyna Mędrala, Jerzy W. Mietelski, Justyna Miszczyk, Alona Mozgova, Antonio Napolitano, Vahab Nazari, Y. Jack Ng, Michał Niedźwiecki, Cristina Oancea, Bogusław Ogan, Gabriela Opiła, Krzysztof Oziomek, Maciej Pawlik, Marcin Piekarczyk, Bożena Poncyljusz, Jerzy Pryga, Matías Rosas, Krzysztof Rzecki, Jilberto Zamora-Saa, Katarzyna Smelcerz, Karel Smolek, Weronika Stanek, Jarosław Stasielak, Slawomir Stuglik, Jolanta Sulma, Oleksandr Sushchov, Manana Svanidze, Kyle Tam, Arman Tursunov, José-M. Vaquero, Tadeusz Wibig, Krzysztof W. Woźniak

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmic rays; cosmic ray ensembles; extensive air showers; large scale cosmic ray correlations; CREDO Collaboration

Online: 14 October 2020 (10:34:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202110.0275.v2

Cosmological Expansion Rate–Various Measurement Results and Interpretation

Volkmar Müller

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Cosmological expansion; Earth expansion; common expansion rates; recession velocity / relative velocity; examples

Online: 21 February 2023 (02:28:33 CET)

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Preprint ARTICLE | doi:10.20944/preprints201808.0019.v1

X-ray Shaping of Planetary Nebulae

Martin A Guerrero

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: planetary nebula; X-ray; stellar evolution

Online: 1 August 2018 (12:04:48 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202012.0743.v1

MONG: An extension to Galaxy Clusters

Louise Rebecca, Arun Kenath, C Sivaram

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark matter; dark energy; modified Newtonian gravity; flat rotation curve; velocity-distance curve

Online: 30 December 2020 (07:52:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints202110.0129.v1

How Are Red and Blue Quasars Different? The Radio Properties

Victoria Anne Fawcett, David Alexander, David Rosario, Lizelke Klindt

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: Quasars; Galaxies; Radio; Supermassive Black-Holes

Online: 8 October 2021 (09:12:59 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202402.0712.v1

In an Eggshell: Baryonic Black Hole Universe with CMB Cycle for Gravity and Λ

Matthew R. Edwards

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmic microwave background; Hubble redshift; black hole; black hole universe; gravastar; optical gravity

Online: 12 February 2024 (16:26:11 CET)

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Preprint ARTICLE | doi:10.20944/preprints202002.0253.v1

Total Electron Content Variation Over HALY (Al-Jouf), Saudi Arabia and Comparison with IRI-2012 and IRI-2016 Models

Sunil Sharma

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: GPS; IRI-2012; IRI-2016; Saudi Arabia

Online: 18 February 2020 (03:01:49 CET)

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Preprint ARTICLE | doi:10.20944/preprints201809.0310.v1

Binary Star Database BDB: New Developments and Applications

Oleg Malkov, Aleksey Karchevsky, Pavel Kaygorodov, Dana Kovaleva, Nikolay Skvortsov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: astronomical data bases; catalogues; binaries: general; cataclysmic variables

Online: 17 September 2018 (12:53:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202103.0575.v3

Black Holes or an Objects without Event Horizon?

Leonid Verozub

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: alternative theory of gravitation; astrophysics; black Holes

Online: 9 December 2021 (15:49:47 CET)

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Preprint ARTICLE | doi:10.20944/preprints201911.0355.v1

The Energetics of the an ExB Propulsor That Avoids the Hidden Momentum Pitfall

Remi Cornwall

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: momenergy; static Poynting vector flow; zeropoint; ion propulsion

Online: 28 November 2019 (09:31:46 CET)

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Preprint ARTICLE | doi:10.20944/preprints201911.0056.v1

Strange Stars Models in the Color-Flavor Locked State

Manuel Malaver, Hamed Daei Kasmaei

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: color-flavor-locked phase; gravitational potential; adjustable parameter; anisotropy; strange matter

Online: 6 November 2019 (06:56:23 CET)

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Preprint ARTICLE | doi:10.20944/preprints202205.0266.v2

Before the Big Bang: the Apollonian Universe

Enrique Gaztanaga

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmology; dark energy; general relativity; black holes

Online: 14 July 2022 (03:50:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201911.0142.v1

Effect of Non-Linear Electrodynamics on Weak Field Deflection Angle by Black Hole

Wajiha Javed, Ali Hamza, Ali Övgün

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: weak gravitational lensing; asymptotically flat black hole; deflection angle; non-linear electrodynamics; Gauss-Bonnet theorem

Online: 13 November 2019 (06:41:03 CET)

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Preprint REVIEW | doi:10.20944/preprints202110.0025.v1

Multimessenger Astronomy with Neutrinos

Francisco Salesa Greus, Agustín Sánchez Losa

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: multimessenger astronomy; astroparticle physics; neutrinos

Online: 1 October 2021 (14:43:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202205.0259.v1

Dark Matter in a Galaxy as Vacuum Polarization

Sergey L. Cherkas, Vladimir L. Kalashnikov

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: vacuum energy; dark matter; vacuum polarization; active galaxy nuclei

Online: 19 May 2022 (09:28:13 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202202.0229.v1

The Scale Invariant Vacuum Paradigm: Main Results and Current Progress

Vesselin Gueorguiev, Andre Maeder

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: cosmology: theory - dark matter - dark energy - inflation; galaxies: formation - rotation; Weyl Integrable Geometry; Dirac co-calculus

Online: 18 February 2022 (09:22:34 CET)

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Preprint ARTICLE | doi:10.20944/preprints202204.0197.v2

The Primordial Particle Accelerator of the Cosmos

Asher Yahalom

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: General Relativity; Euclidian Metric; Superluminality; Cosmological Inflation

Online: 26 April 2022 (09:53:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202008.0188.v1

Evolution of Primordial Dark Matter Planets in the Early Universe

Arun Kenath, Kiren O. V., Sivaram C

Subject: Physical Sciences, Astronomy And Astrophysics Keywords: dark matter; DM planets; early universe

Online: 7 August 2020 (11:34:09 CEST)

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