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Dynamical Dark Sector: A Joint Two-Scalar-Field Model for Dark Matter and Quintessence
Silvio A. Correa Junior
The physical nature of dark matter and dark energy remains one of the most pressing questions in modern cosmology. This work presents a phenomenological model where the entire dark sector is described by two minimally coupled scalar fields within General Rela-tivity. The first, an ultra-light scalar field Ψ with mass mΨ, constitutes Fuzzy Dark Matter (FDM), whose coherent oscillations dynamically replicate cold dark matter on large scales. The second, a quintessence field ϕ, evolves under an axion-like potential and serves as the dark energy component. We demonstrate that this framework can successfully reproduce the canonical cosmic history while offering a physical mechanism to address the S8 tension. By exploring the model’s parameter space, we show that the suppression of small-scale structure is a direct function of the FDM mass. For a benchmark mass of mΨ = 10−22 eV, chosen to illustrate the potential impact, we show that the model can produce a value of S8 σ8(Ωm/0.3)0.5 of approximately 0.79, significantly alleviating the tension between early and late-universe probes [1,9,10]. Concurrently, the model predicts a “thawing” behavior for dark energy, with a present-day equation of state, wϕ,0, that depends on the potential’s parameters, yielding wϕ,0 0.92 in our benchmark case—a value distinguishably different from the cosmological constant’s wΛ = 1. We acknowledge that the FDM mass required to affect the S8 tension creates a testable conflict with some Lyman-alpha forest constraints [16], a point we discuss as a key feature for the model’s falsifiability. By connecting cos-mic acceleration, dark matter, and the S8 tension, this self-consistent framework offers a compelling and highly testable alternative to the ΛCDM model, motivating a full statistical analysis.
The physical nature of dark matter and dark energy remains one of the most pressing questions in modern cosmology. This work presents a phenomenological model where the entire dark sector is described by two minimally coupled scalar fields within General Rela-tivity. The first, an ultra-light scalar field Ψ with mass mΨ, constitutes Fuzzy Dark Matter (FDM), whose coherent oscillations dynamically replicate cold dark matter on large scales. The second, a quintessence field ϕ, evolves under an axion-like potential and serves as the dark energy component. We demonstrate that this framework can successfully reproduce the canonical cosmic history while offering a physical mechanism to address the S8 tension. By exploring the model’s parameter space, we show that the suppression of small-scale structure is a direct function of the FDM mass. For a benchmark mass of mΨ = 10−22 eV, chosen to illustrate the potential impact, we show that the model can produce a value of S8 σ8(Ωm/0.3)0.5 of approximately 0.79, significantly alleviating the tension between early and late-universe probes [1,9,10]. Concurrently, the model predicts a “thawing” behavior for dark energy, with a present-day equation of state, wϕ,0, that depends on the potential’s parameters, yielding wϕ,0 0.92 in our benchmark case—a value distinguishably different from the cosmological constant’s wΛ = 1. We acknowledge that the FDM mass required to affect the S8 tension creates a testable conflict with some Lyman-alpha forest constraints [16], a point we discuss as a key feature for the model’s falsifiability. By connecting cos-mic acceleration, dark matter, and the S8 tension, this self-consistent framework offers a compelling and highly testable alternative to the ΛCDM model, motivating a full statistical analysis.
Posted: 03 December 2025
Torsion-Mediated Quantum Entanglement: A Geometric Framework Within Cosmic Energy Inversion CEIT Theory
Ashour Ghelichi
Posted: 01 December 2025
On the Mass of Neutrinos in Flavour State
Engel Roza
Posted: 28 November 2025
Multiple Neutrons in Fission Fragments of ⁴³⁵U: Total Kinetic Energy Correlation and Super Long Fission Mode Dominance
Wenming Sun
Posted: 27 November 2025
Possible Modification of Standard Model Classification of Particles and Fields
Henryk Wojciechowski
Posted: 18 November 2025
Electrical and Magnetic Interactions as Manifestations of 5-Dimensional Space Geometry and Vacuum Energy Density Dynamics
Vadim Khoruzhenko
Posted: 18 November 2025
A Complete Derivation of Quantum Mechanics from Classical Field Theory - Part B: Emergence of Quantum Gravity
Ruhi Abdallah
Posted: 17 November 2025
E₈ Symmetry and Spectral Geometry in Quantized Spacetime: A Geometric Origin of Fermion Mass Hierarchies and Koide’s Relation
Jau Tang
Posted: 13 November 2025
Quantum–Geometric Origin of Dark Energy and Λ-CDM: Predictive Sedenionic Gauge Field Cosmology
Jau Tang
Posted: 13 November 2025
Approach to Gravity and Cosmology Beyond Einstein’s Relativity
Jau Tang
Posted: 13 November 2025
Description of the Electron in the Electromagnetic Field: The Dirac type Equation and the Equation for the Wave Function in Spinor Coordinate Space
Pavel Gorev
Posted: 11 November 2025
Microphysical Extensions: Topology, Spectrum, Confinement, and Scale Continuity (Complete Derivations and Step-by-Step Analysis)
Adam Chakchaev
Posted: 10 November 2025
A Geometric Symmetry Model of the Electron’s Anomalous g-Factor
Milan Marcel Dlabal
Posted: 10 November 2025
Temporal Convergence Framework: Distinguishing Structure from Coincidence in High-Precision, Low-Dimensionality Parameter Spaces
Andrew Michael Brilliant
Posted: 07 November 2025
Quantum Reality from Micro-Causal Geometry: A Wavefunction-Free Resolution of Quantum Paradoxes
Jau Tang
Posted: 07 November 2025
Quantum Gravity I—Emergent Hypercomplex Operator Gauge Theory for Microcausal Lattice Spacetime
Jau Tang
We propose a novel operator-based formulation of quantum gravity grounded in two foundational principles: a discrete causal lattice and algebraic microcausality. Departing from traditional continuum approaches and wavefunction-based quantum mechanics, this framework models spacetime and matter as emergent phenomena arising from the algebraic structure of displacement operators. In this first part of a two-part series, we construct the foundational framework and demonstrate how key features of quantum mechanics—such as the uncertainty principle, de Broglie relations, and entanglement—emerge naturally without invoking wavefunctions, path integrals, or metric-based geometry. Operator non-commutativity on the causal lattice gives rise to a self-consistent quantum structure with natural ultraviolet finiteness, intrinsic time directionality, and a microcausal interpretation of measurement. This foundational part lays the groundwork for gravitational dynamics, cosmology, and the grand unification principles of gravity and the Standard Model to be explored in the sequel to quantum gravity part II.
We propose a novel operator-based formulation of quantum gravity grounded in two foundational principles: a discrete causal lattice and algebraic microcausality. Departing from traditional continuum approaches and wavefunction-based quantum mechanics, this framework models spacetime and matter as emergent phenomena arising from the algebraic structure of displacement operators. In this first part of a two-part series, we construct the foundational framework and demonstrate how key features of quantum mechanics—such as the uncertainty principle, de Broglie relations, and entanglement—emerge naturally without invoking wavefunctions, path integrals, or metric-based geometry. Operator non-commutativity on the causal lattice gives rise to a self-consistent quantum structure with natural ultraviolet finiteness, intrinsic time directionality, and a microcausal interpretation of measurement. This foundational part lays the groundwork for gravitational dynamics, cosmology, and the grand unification principles of gravity and the Standard Model to be explored in the sequel to quantum gravity part II.
Posted: 06 November 2025
A Categorical Framework for the Higgs Mechanism in the Standard Model and Theories with Massive Gravitons
Moninder Singh Modgil
,Dynandeo Dattatray Patil
Posted: 03 November 2025
Study of the ρ0 Decay into π0π0γ Within Framework of Chiral Perturbation Theory with Resonances
JA Barajas-Aguilar
,FV Flores-Baez
,JR Morones-Ibarra
Posted: 30 October 2025
An Intrinsic Coordinate Reference Frame Procedure I: Tensorial Canonical Weyl Scalars
Cooper K. Watson
,William Julius
,Patrick Brown
,Donald Salisbury
,Gerald B. Cleaver
Posted: 30 October 2025
Origin of Gravitational Force — Model of Self-Forming Electric Dipoles with Dynamically Self-Calibrating Constant Mutual Attraction
Shangqing Liu
Posted: 20 October 2025
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