Abstract: Lunar laser ranging (LLR) has currently achieved millimeter-level ranging accuracy, establishing itself as a powerful tool for testing general relativity, particularly the equivalence principle. However, atmospheric delay introduces spurious signals in LLR-based equivalence principle tests, significantly degrading parameter constraint precision. Through analysis of observational data from the Grasse station—which has contributed the most normal point data in recent years—we demonstrate that atmospheric delay may significantly affect the test of equivalence principle. Moreover, this paper provides a comprehensive analysis of how temporal and elevation-angle non-uniformity in atmospheric delay distribution affects equivalence principle tests. Simulation results demonstrate that fixing the elevation angle significantly enhances the precision of equivalence principle tests. Therefore, to achieve more stringent constraints, it is recommended to analyze segments from the long-term ranging archive that have minimal variation in elevation angle.

Abstract: This study advances the scientific program of Copernicus, Kepler, and Newton into the realm of tectonic processes. A generalization of Euler's rigid-body rotation theory to the case of an arbitrarily deformable spheroid is obtained. The generalized Copernican problem is solved: from the decomposition of motions into four elementary rotations to finding their compositions that describe complex trajectories of points on the Earth's surface. By analogy with Kepler's laws, the First Law of Tectonic Motion is established—a fundamental invariant of motion on a deformable spheroid asserting the preservation of conformal structure: the trajectories of tectonic motion are orbits of the Möbius group action. This approach creates a unified kinematic model linking astronomical variations in Earth's rotation with tectonic deformations, without invoking any hypotheses about the planet's internal structure.

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The Dead Universe Theory (DUT) proposes that the observable universe is not an isolated, ever-expanding system emerging from a primordial singularity, but a thermodynamically decaying domain embedded within the collapsed geometry of a prior cosmological phase. In this framework, the visible cosmos constitutes a localized photonic anomaly—a transient luminous fluctuation—formed inside a large-scale structural black hole generated by the exhaustion of a former universe. Rather than ending in a Big Rip, Big Freeze, or Big Crunch, DUT predicts an asymmetric thermodynamic retraction in which usable energy is progressively depleted, driving the cosmos toward structural infertility and thermodynamic death on a timescale of order 10² Gyr (≈ 166 billion years). Beyond this horizon, matter persists only in fossilized configurations such as planets, stellar remnants, black holes, and extinguished galaxies, forming a “dead universe”. This thesis develops the mathematical, thermodynamic, and computational foundations of DUT and tests its consequences against current observational data. The work combines (i) entropic retraction equations with time-dependent curvature and entropy-derived cosmological terms, (ii) the Cosmic Fossil Record Method for dating the exhaustion of cosmic energy, and (iii) numerical simulations of galactic evolution under finite-energy and high-entropy constraints. These simulations reproduce quenching histories, fossil signatures, and an entropic horizon consistent with a structurally dying universe. Remarkably, DUT-based simulations anticipated several deep-field results from the James Webb Space Telescope, including compact galaxies at z > 13 and a population of Small Red Dots (SRDs) at z ≈ 15–20. The theory yields falsifiable predictions, such as a measurable excess of compact high-redshift systems, a mildly negative curvature parameter (Ωₖ ≈ −0.07 ± 0.02), and a declining structural natality of galaxies with cosmic time. By providing reproducible codes, explicit equations, and clear observational tests, DUT is presented as a coherent and testable alternative to ΛCDM for modeling cosmic chronology, entropy dynamics, and large-scale gravitational architecture.

Abstract: Hawking’s cosmology logically leads to an observed multiverse. This article proposes a novel hypothesis for the physical nature and existence of dark matter, derived from his cosmology This article argues it is a superposition of at least three 3-dimensional universes in a 4-dimensional space, of which two dimensions overlap with our universe. Nothing that could disturb the superposition exists outside it. This, with the dimensions of strings in String theory, explains why dark matter causes a linear decrease in gravity with distance to visible mass at large radii in galaxies. To support this, the visible matter distribution in the disks and bulges, calculated by the SPARC team, and the observed rotation velocities are used. Lelli and Mistele showed that the common way to project dark matter halos around galaxies cannot be valid. In this article it is shown a valid alternative is to model dark matter as three added wire-like masses in the centre of galaxies in General Relativity.Linear mass density is a key parameter and explains the weak effect in the centre of galaxies and the strong effect at larger distances as well as the rapid development of large galaxies in the early universe as reported by Labbé. A new prediction method for rotation velocities, that works at all radii in galaxies, is 19 % more accurate than MOND. In galaxy clusters the improvement of the predicted velocity dispersions compared with the Newtonian approach and with MOND is 44 to 57 % over a huge range of cluster masses.

Abstract: We propose a Chrono-Quantum Field Theory framework in which time is a complex scalar wave with phase and frequency but without intrinsic amplitude, while three-dimensional quantized space furnishes the amplitude through a spatial-amplitude operator. Writing t = iτ, the composite physical field Φ(x, τ) = A(x)Ψ_t(x, τ) intertwines an imaginary-time oscillation with a real spatial amplitude lattice. From a minimal postulate set we derive a covariant field equation, an effective proper-time law consistent with local Lorentz invariance, and a catalogue of falsifiable predictions. We then present a complete comparison with Einstein’s Special and General Relativity (SR/GR) across standard tests (time dilation, transverse Doppler, gravitational redshift, Shapiro delay, light bending, perihelion advance, frame dragging, binary pulsars, gravitational waves, GPS). Coarse-graining the temporal spectrum and spatial amplitude yields a positive effective vacuum term compatible with late-time acceleration (dark energy), while near-horizon behavior can be interpreted as a temporal-phase singularity. Finally, we outline a Chronodynamic Quantum Computer (CQC) that encodes information in temporal phase and uses the spatial lattice as amplitude memory, suggesting noise-shaping benefits and relativistic timing built-in. The paper closes with philosophical implications, discussion of limitations, and clearly targeted experimental pathways.

Abstract: This study investigates round-trip Earth–Mars–Earth missions during the 2031 opposition, applying a trajectory design framework derived from the early orbital configuration of asteroid 2001 CA21. Using Lambert-based analysis and JPL Horizons ephemerides, two optimized and dynamically consistent mission architectures were identified: a rapid scenario featuring a 33-day outbound transfer, a 30-day surface stay, and a 90-day return (total ≈ 153 days), and a feasible scenario combining a 56-day outbound transfer, a 35-day surface stay, and a 135-day return (total ≈ 226 days). Both trajectories were validated through full ephemeris computation, confirming heliocentric coherence within the CA21-anchored orbital plane and physically realistic departure and arrival velocities. The 2031 alignment minimizes plane-change penalties and yields energetically balanced outbound and inbound arcs. These findings demonstrate that short-duration, reversible Earth–Mars missions can be designed from early asteroid-derived orbital templates, establishing a predictive framework for identifying future high-velocity transfer opportunities.

Abstract: The cosmic microwave background is often taken as definitive evidence for universal expansion. No static framework has yet reproduced its exact blackbody spectrum under known physical conditions. This study extends the companion paper Redshift Without Expansion by applying a frequency-independent redshift mechanism within a Liouville formulation. The kinetic redshift operator preserves a perfect Planck spectrum, maintains μ = 0, and yields T ∝ K−1 with an identical temperature–redshift relation T (z) = T0(1 + z) consistent with measurements from COBE and FIRAS. Photon number and energy densities evolve as ˙nγ = −3Heff nγ and ˙ργ = −4Heff ργ , where Heff = ˙K/K represents an effective Hubble parameter without metric expansion. The result establishes an observational degeneracy between kinetic redshift and geometric expansion while predicting a measurable secular temperature drift ˙T /T = −Heff ≈ −2.3 × 10−18 s−1. The framework provides a static, falsifiable pathway for examining the cosmic microwave background without reliance on expanding-space assumptions.

Abstract: Early orbital predictions for the near-Earth asteroid 2001 CA21 — based on 2015 JPL Horizons data — revealed a trajectory with an eccentricity of 0.777, a perihelion of 0.373 AU, and an aphelion extending to 2.967 AU. While subsequent refinements altered the asteroid’s actual orbit, these initial parameters provided a valuable reference template for designing rapid Earth–Mars transfers. By anchoring transfer-plane geometry to the CA21 orbital solution, we identified novel mission opportunities capable of drastically reducing interplanetary travel times.Our analysis highlights the 2031 opposition as the most favorable case: a 56-day transfer with , only marginally exceeding the New Horizons record, and , challenging but potentially addressable with aerocapture or braking tug concepts. A 33-day extreme trajectory is also geometrically possible in 2031, though requiring departure energies ( ) and arrival speeds ( ) well beyond current or near-term propulsion systems.Earlier opportunities in 2027 and 2029, while closer in time, impose even higher energetic barriers (departure velocities ~19 km/s, arrival ~17.5–20 km/s), underscoring the counterintuitive reality that shorter Earth–Mars distances do not guarantee lower transfer energy.This study therefore proposes a new methodological framework: using early asteroid orbital predictions as trajectory templates to identify both feasible and aspirational rapid-transit missions. By linking NEO orbital geometry with Lambert-based transfer analysis, we establish practical benchmarks for propulsion and capture technologies, demonstrating that 2031 provides a near-term achievable baseline, while also defining the aspirational frontier of one-month Mars missions.

Abstract: As the near-Earth space domain becomes increasingly congested, the field of space domain awareness (SDA) has risen in importance and motivated the use of non-traditional sensors. One such class of sensor is high frequency (HF) radar operating in line-of-sight (LOS) mode, as their large surveillance field-of-view enables simultaneous tracking of several objects. HF signals are, however, subject to ray bending and group retardation when propagating through the ionosphere. This paper demonstrates the development and implementation of a method for calculating the ionospheric correction for HF LOS satellite observations, using three-dimensional numerical ray tracing through a climatological model ionosphere. Defence Science and Technology Group's experimental HF LOS radar was deployed during a SpaceFest trial in late 2020, and recorded observations of resident space objects (RSOs). The ionospheric correction is applied to these observations and compared to propagations obtained from the reported two line elements (TLEs) of the RSOs to assess the correction performance. The results demonstrate that, even during weak ionospheric conditions, ray tracing through a climatological model ionosphere produces a significant improvement in the residuals between the range measurements and TLEs.

Abstract: In this study, we report the exceptional observations of amplified eastward subauroral polarization streams (SAPS) made in the topside ionosphere near magnetic midnight during 2015-2016 in 17 events. Our results show the eastward SAPS flows streaming sunward after magnetic midnight and antisunward before magnetic midnight: in concert with the duskward-intruding dawn convection cell. These demonstrate that the eastward SAPS flow’s amplification was primarily caused by (1) the extension of equatorward-directed convection electric field (EC) to subauroral latitudes. Further evidence is provided by one set of correlated magnetosphere-ionosphere (M-I) conjugate observations showing (2) the inward (earthward) EC field near the inner-magnetosphere plasmapause (on the tailward side) and the emerging eastward SAPS in the topside ionosphere and thus implying (3) the EC field’s mapping-down and propagation to subauroral latitudes in the coupled M-I system. In the topside ionosphere, the amplified eastward SAPS flow reached ~3000 m/s in magnitude within the deep plasma density trough, where the electron temperature maximized at ~7000 K. There, (4) the underlying positive feedback mechanisms created favorable ionospheric conditions for SAPS growth. Finally, we conclude that the combination of these (1-4) mechanisms played a crucial role in the amplification of the near-midnight eastward SAPS flows observed.

Abstract: The present work discusses the birth of the Universe via quantum tunneling through a potential barrier, based on quantum cosmology, taking into account a running cosmological constant. We consider the Friedmann-Lemaître-Robertson-Walker (FLRW) metric with positively curved spatial sections ($k = 1$) and the matter content is a dust perfect fluid. The model was quantized by the Dirac formalism, leading to a Wheeler-DeWitt equation. We solve that equation both numerically and using a WKB approximation. We studied the behavior of tunneling probabilities $TP_{WKB}$ and $TP_{int}$ by varying the energy $E$ of the dust perfect fluid, the phenomenological parameter $\nu$, the present value of the Hubble function $H_0$ and the constant energy density $\rho^0_\Lambda$, all the last three parameters associated with the time-varying cosmological constant.

Abstract: This paper conducts a technical study on a method for determining the occurrence threshold of wind shear based on historical sounding data. After analyzing the impact of low-altitude wind shear on aircraft flight safety, a method for determining the occurrence threshold of wind shear based on historical sounding data is proposed. A statistical analysis of the sounding data from the test area over a period of 15 years from 2010 to 2024has been conducted, which includes the occurrence events and probability statistics of 1000m wind shear for all 12 months of the year. Simulation results validate the feasibility and effectiveness of the method for determining the occurrence threshold of wind shear based on historical sounding data in the test area, forming a method that can be extended to all altitude ranges of aircraft flight and all flight regions globally. This statistical method provides a technical foundation for the efficient detection of wind shear at local airports and enhances flight safety at these airports.

Abstract: Three stations in the Asia-Pacific region are selected to form two time comparison links. By comparing the correction accuracy of the satellite orbits and clock deviations of the PPP-B2b messages broadcast by the two GEO satellites of BDS-3 C59 and C61, and taking the time comparison results obtained by the GBM post-ephemeris as a reference, the accuracy of the time comparison of the PPP-B2b messages broadcast by the two GEO satellites C59 and C61 was evaluated. The results show that the accuracy of time comparison between C59 and C61 is similar, but the stability and availability of C59 are better than those of C61. In addition, five IGS/IGMAS stations were selected to evaluate the accuracy of the PPP-B2b message transmitted by the C59 and C61 GEO satellites for BDS-3 positioning, using the IGS/IGMAS weekly solution positioning results as a reference. The results show that the static positioning of PPP-B2b broadcasted by C59 and C61 can reach centimeter level, and the simulated kinematic positioning can reach decimeter level. The positioning accuracy of C59 is higher than that of C61.

Abstract: We present a unified, field-based explanation for the formation, alignment, and expansion behavior of cosmic filaments and voids. Building upon the Resonance-Suppression (RS) framework, we propose that large-scale cosmic structure emerges from coherent harmonic scaffolding modulated by suppression fields—quantum-scale filters that regulate energy distribution, wave reinforcement, and space time connectivity. Unlike standard ΛCDM models, which depend on dark matter particles and inflationary perturbation seeds, the RS model derives filament and void geometry directly from wave interference principles, requiring no exotic matter. This approach provides a falsifiable alternative that predicts quantized filament spacing, void boundary coherence, and harmonic clustering, with strong alignment to observational datasets. Through a combination of field derivations and observational tests, we show that filament thickness, void asymmetry, and AGN clustering patterns all emerge naturally from resonance envelopes without fine-tuning. Filaments represent stabilized resonance nodes, while voids arise from off-resonance suppression basins. Our model outperforms classical alternatives in both predictive power and falsifiability, and aligns closely with recent filament alignment studies, CMB-lensing cross-correlations, and gravitational wave echo predictions. This paper follows a structured approach: we first derive the RS field’s gravitational role, define its mathematical formalism, and then validate it across key cosmological observables. Finally, we offer a falsifiable predictions list and a full parameter formulation for future testing. Our findings suggest that the cosmic web may be less a chaotic byproduct and more a harmonic expression of a deeply ordered spacetime field.

Abstract: In the Lorentz transformation, light is chosen as the observation medium to derive the coordinate relationship for spacetime conversion, which is then applied in the theory of special relativity. However, this approach overlooks the impact of the characteristics of the selected observation medium on spacetime conversion, leading to limitations in the understanding of spacetime effects. This paper proposes a new Extended Lorentz Transformation theory and methodology. The analysis results lead to an important conclusion: spacetime effects are essentially subjective measurement errors caused by the observation method and are independent of the reference frame and the motion state of the object. The speed of the observation medium is the fundamental cause of measurement errors. The higher the speed, the smaller the error. When the speed is infinite, the spacetime effects vanish, and the measurement error becomes zero. Acoustic waves are used as the observation medium for verification. The results show that even when the object's motion speed is relatively low, significant space-time effects can still occur, leading to substantial measurement errors. Compared with light under the same conditions, there are significant differences in spacetime effects, indicating that the light observation medium is merely a special case of human subjective choice for observing the motion of objects, and the observation results do not have universal applicability. The conclusion regarding spacetime effects in Einstein's special relativity does not hold. To further expand the scope of applicability of relativity, this paper derives the formula for calculating space-time effects in non-uniformly speed reference frames.

Abstract: Modern theories of particle physics have revealed that the electric charge can be fractional such as that of quarks [1]. For this reason, we can imagine an analogous scenario for the magnetic charge. Extending the concepts of magnetic potential theory we can introduce a fractional magnetic charge, the metapole. Some important properties of this fractional magnetic charge are described together with an outline of some fundamental consequences of its possible existence.

Abstract: Space weather originates from the Sun’s dynamic activity, driven by processes such as solar flares, coronal mass ejections (CMEs), and the continuous stream of charged particles known as the solar wind. This essay explores the fundamental mechanisms behind these solar phenomena and their role in shaping the space environment across the solar system. It details how the Sun’s magnetic field and energetic emissions interact with planetary atmospheres, magnetospheres, and surfaces, influencing planetary evolution and atmospheric retention. Additionally, the study examines the variations in space weather effects across different planetary bodies, from magnetically shielded planets like Earth to atmosphereless bodies such as the Moon or a comet. Analyzing these interactions, the essay provides a comprehensive understanding of the Sun’s influence in structuring the heliospheric environment and its implications for planetary systems.

Abstract: Implied by the terminologies “Harang Reversal” and “Harang Discontinuity”, there are two significant features of the Harang region. (i) The reversal of auroral electrojet along with the underlying plasma convection flow and electric (E) fields and (ii) the discontinuity between the electrojets/convection flows/E fields. Even the earliest studies reported the discontinuity observed in the meridional E field. Conversely, some of the previous studies state that convection flow- and E field-reversals do not involve any physical discontinuity. We investigate these two features (i-ii) observed in five topside-ionosphere Harang scenarios. Each scenario occurred during a sequence of events, which led to the onset of substorm expansion phase, when the Harang region was newly formed. Results show (1) the newly-formed Harang region between the dusk and dawn convection cells, where one convection cell wraps around the other, (2) the zonal drift- and E field-reversals, (3) the discontinuity between the dusk and dawn convection flows and also between the reversing E field components, and (4) the earthward electromagnetic energy deposition locally minimizing or diminishing within the discontinuity and peaking within the reversing zonal drift and E fields. Thus, the convection flow- and E field-reversals observed involved the development of discontinuity.

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This study examines the mineral composition of volcanic samples similar to lunar materials, focusing on olivine and pyroxene. Using hyperspectral imaging (HSI) from 400 to 1000 nm, we created data cubes to analyze reflectance characteristics of samples from Italy’s Vulcano region, categorizing them into nine regions of interest (ROIs) and analysing spectral data for each. We applied various unsupervised clustering algorithms, including K-Means, Hierarchical Clustering, Gaussian Mixture Models (GMM), and Spectral Clustering, to classify the spectral profiles. Principal Component Analysis (PCA) revealed distinct spectral signatures associated with specific minerals, facilitating precise identification. Clustering performance varied by region, with K-Means achieving the highest silhouette score of 0.47, whereas GMM performed poorly with a score of only 0.25. Non-negative Matrix Factorization (NMF) aided in identifying similarities among clusters across different methods and reference spectra for olivine and pyroxene. Hierarchical clustering emerged as the most reliable technique, achieving a 94% similarity with the olivine spectrum in one sample, whereas GMM exhibited notable variability. Overall, the analysis indicated that both Hierarchical and K-Means methods yielded lower errors in total measurements, with K-Means demonstrating superior performance in estimated dispersion and clustering. Additionally, GMM showed a higher root mean square error (RMSE) compared to the other models. The RMSE analysis confirmed K-Means as the most consistent algorithm across all samples, suggesting a predominance of olivine in the Vulcano region relative to pyroxene. This predominance is likely linked to historical formation conditions similar to volcanic processes on the Moon, where olivine-rich compositions are common in ancient lava flows and impact melt rocks. These findings provide a deeper context for mineral distribution and formation processes in volcanic landscapes.

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The paper presents a simulation physical model of laser thruster under vacuum back pressure environment. Through the finite difference method and the Direct Simulation Monte Carlo (DSMC) calculation method, based on the actual laser thruster structure and working mode, the changes of the flow field distribution in the laser thruster plume under different vacuum back pressure conditions are obtained. The influence of different vacuum back pressure conditions on the plume density field and velocity field of the thruster was verified through physical experiments, and the evolution process of the plume flow field during laser ablation of polyamide glycidyl ether (GAP) solid target material was analyzed in detail. The simulation results are in good agreement with the test results, and the deviation between the simulated data and the test data from 0 to 3000ns is less than 10.4%. It presents a foundation for the prediction model of laser thruster under vacuum environment, and provides an important reference for ground test and in-orbit application of satellite laser propulsion system.