An iterative AI reasoning process proposes new dynamical dark energy equations of state that are competitive with traditional forms on supernova, BAO, and Planck data.
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Damped harmonic oscillator dark energy EoS fitted to CMB+BAO+BBN+chronometers+SNIa data yields H0 values reducing tension to 1.4 sigma for DESY5/Union3 while Pantheon+ prefers near-critical damping; Bayesian evidence inconclusive vs LambdaCDM.
Any background-inert λ in coincident f(Q) gravity degenerates with σ80 via an As-D0(λ) link, inflating σ80 to unphysical levels and raising As by 20-30% in tension with Planck unless fixed by As priors.
Requiring the RG flow of the de Sitter entropy parameter α to increase monotonically toward the infrared yields a cosmological constant matching the observed value.
Introduces Fractional Holographic Dark Energy (FHDE) via fractionally corrected entropy from a modified Wheeler-DeWitt equation and studies its late-time cosmology, field reconstructions, and extensions to modified gravity theories.
A bare-bones cosmological model of artificial infection spread finds that spawn rates above roughly one per million galaxies at 0.1c would infect half the universe by today, tightening constraints on aggressive self-propagating technology.
Rényi entropic corrections to cosmology are constrained by DESI DR2 BAO and GW data to a viable quintessence-like model that approaches ΛCDM without phantom behavior and satisfies BBN bounds.
The paper derives leading-order de Sitter corrections of order Lambda to gravitational wave displacement and spin memory using an adapted Bondi-Sachs framework.
A single power-law effective scaling anchored at today's Hubble rate is extrapolated to inflation and required to match the Starobinsky plateau within O(1) factors, selecting γ ≈ 0.49 and β ≈ 0.68.
Current GRB and SNe Ia data with full covariance do not provide evidence for interacting dark energy over Lambda CDM.
In a viable f(R) model transitioning from early GR-like to late non-GR behavior, matter power spectra show higher monopole and quadrupole power at small scales with quadrupole elevated at large scales up to k~0.02, while scalaron mass decreases over time to GR limits on galactic scales.
Natural SUSY with axino LSP allows viable mixed axion-axino dark matter matching the observed abundance for axino masses near 100 keV and PQ scales of 10^11 to 3x10^12 GeV in DFSZ and KSVZ models.
Forecasts show that ~66 optical GRBs can achieve σ_w ≈ 0.47 in wCDM using Dainotti relations, matching Planck precision and enabling independent high-redshift tests of dark energy.
The authors constrain power-law f(T) teleparallel gravity models via logarithmic and log-periodic deceleration parameter ansatzes fitted to cosmic chronometer and Pantheon datasets, finding departure from ΛCDM.
Observational constraints on a dark energy EoS parametrization in curved spacetime yield α ≈ 0.35 (0.56) and Ω_k0 that changes sign with ANN data reconstruction.
A spinor-field Modified Chaplygin Gas model in Kantowski-Sachs spacetime yields H0 of 67-68 km/s/Mpc, late-time isotropy, q0 of -0.49, and a better AIC fit than LambdaCDM.
In f(T) gravity with Gong-Zhang EoS parametrization, the fitted model shows transient acceleration followed by future deceleration and satisfies thermodynamic consistency.
Dynamical systems analysis in f(R,L_m,T) gravity identifies stable critical points that describe different evolutionary phases of the Universe.
Claims classical derivation of Planck spectrum via scale parameter for zero-point radiation in cavities, with parameter value order of h.
Derives background solutions for linear f(Q,T)=αQ+βT plus DBI field and reports MCMC posteriors from Hubble, BAO, and SNIa data that are consistent with late-time constraints.
f(Q,T) gravity with linear form and affine EoS is constrained by CC, Pantheon+SH0ES and DESI BAO data, yielding a present universe age consistent with Planck within 1σ.
citing papers explorer
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Physics-guided discovery of dynamical dark-energy equations of state through iterative AI reasoning
An iterative AI reasoning process proposes new dynamical dark energy equations of state that are competitive with traditional forms on supernova, BAO, and Planck data.
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Damped Harmonic Oscillator Dark Energy and the Hubble Tension
Damped harmonic oscillator dark energy EoS fitted to CMB+BAO+BBN+chronometers+SNIa data yields H0 values reducing tension to 1.4 sigma for DESY5/Union3 while Pantheon+ prefers near-critical damping; Bayesian evidence inconclusive vs LambdaCDM.
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The Amplitude-Growth Degeneracy and Implied $A_s$ Diagnostic for Background-Inert Modified Gravity
Any background-inert λ in coincident f(Q) gravity degenerates with σ80 via an As-D0(λ) link, inflating σ80 to unphysical levels and raising As by 20-30% in tension with Planck unless fixed by As priors.
-
Microscopic entropy of de Sitter spacetime and entropic solution to the old cosmological constant problem
Requiring the RG flow of the de Sitter entropy parameter α to increase monotonically toward the infrared yields a cosmological constant matching the observed value.
-
An Interplay Between Fractional Calculus and Holographic Dark Energy
Introduces Fractional Holographic Dark Energy (FHDE) via fractionally corrected entropy from a modified Wheeler-DeWitt equation and studies its late-time cosmology, field reconstructions, and extensions to modified gravity theories.
-
The Cosmological Hart-Tipler Conjecture
A bare-bones cosmological model of artificial infection spread finds that spawn rates above roughly one per million galaxies at 0.1c would infect half the universe by today, tightening constraints on aggressive self-propagating technology.
-
Exploring Cosmic Evolution in R\'enyi Entropic Cosmology with Constraints from DESI DR2 BAO and GW Data
Rényi entropic corrections to cosmology are constrained by DESI DR2 BAO and GW data to a viable quintessence-like model that approaches ΛCDM without phantom behavior and satisfies BBN bounds.
-
de Sitter Corrections to Gravitational Wave Memory
The paper derives leading-order de Sitter corrections of order Lambda to gravitational wave displacement and spin memory using an adapted Bondi-Sachs framework.
-
A cross-epoch endpoint-consistency test of a single effective scaling from dark energy to inflation
A single power-law effective scaling anchored at today's Hubble rate is extrapolated to inflation and required to match the Starobinsky plateau within O(1) factors, selecting γ ≈ 0.49 and β ≈ 0.68.
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Interacting dark energy constraints from Fermi GRBs and Pantheon+ SNe Ia with full GRB covariance
Current GRB and SNe Ia data with full covariance do not provide evidence for interacting dark energy over Lambda CDM.
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Cosmological perturbations with $f(R)$ gravity scalarons : Galaxy power spectra and the scalaron mass
In a viable f(R) model transitioning from early GR-like to late non-GR behavior, matter power spectra show higher monopole and quadrupole power at small scales with quadrupole elevated at large scales up to k~0.02, while scalaron mass decreases over time to GR limits on galactic scales.
-
Natural SUSY with mixed axion/axino dark matter
Natural SUSY with axino LSP allows viable mixed axion-axino dark matter matching the observed abundance for axino masses near 100 keV and PQ scales of 10^11 to 3x10^12 GeV in DFSZ and KSVZ models.
-
Gamma-Ray Bursts as an Independent High-Redshift Probe of Dark Energy
Forecasts show that ~66 optical GRBs can achieve σ_w ≈ 0.47 in wCDM using Dainotti relations, matching Planck precision and enabling independent high-redshift tests of dark energy.
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Probing cosmic dynamics in $f(T)$ teleparallel gravity: Constraints from logarithmic and log-periodic deceleration ansatzes
The authors constrain power-law f(T) teleparallel gravity models via logarithmic and log-periodic deceleration parameter ansatzes fitted to cosmic chronometer and Pantheon datasets, finding departure from ΛCDM.
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Constraining Dark Energy Dynamics in Curved Spacetime with Current Observations
Observational constraints on a dark energy EoS parametrization in curved spacetime yield α ≈ 0.35 (0.56) and Ω_k0 that changes sign with ANN data reconstruction.
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Testing an anisotropic spinor field--based Modified Chaplygin Gas model in Kantowski--Sachs spacetime with observational constraints
A spinor-field Modified Chaplygin Gas model in Kantowski-Sachs spacetime yields H0 of 67-68 km/s/Mpc, late-time isotropy, q0 of -0.49, and a better AIC fit than LambdaCDM.
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Transiently accelerating cosmological model with Gong-Zhang parametrization in $f(T)$ teleparallel gravity
In f(T) gravity with Gong-Zhang EoS parametrization, the fitted model shows transient acceleration followed by future deceleration and satisfies thermodynamic consistency.
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Evolutionary Phase of Universe in $f(R,L_m,T)$ Gravity: The Dynamical System Analysis
Dynamical systems analysis in f(R,L_m,T) gravity identifies stable critical points that describe different evolutionary phases of the Universe.
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Classical Planck Spectrum for Relative Thermal Radiation, Classical Zero-Point Radiation, and Scale Parameter
Claims classical derivation of Planck spectrum via scale parameter for zero-point radiation in cavities, with parameter value order of h.
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Observational Constraints on $f(Q,T)$ Gravity in the Presence of DBI-Essence Scalar Field
Derives background solutions for linear f(Q,T)=αQ+βT plus DBI field and reports MCMC posteriors from Hubble, BAO, and SNIa data that are consistent with late-time constraints.
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The $f(Q, T)$ gravity and affine EoS: observational aspects
f(Q,T) gravity with linear form and affine EoS is constrained by CC, Pantheon+SH0ES and DESI BAO data, yielding a present universe age consistent with Planck within 1σ.
- Generalized Mass-to-Horizon Entropy and Horizon Thermodynamics