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.
Computes perturbation amplitudes in general effective multi-field inflation without sub-horizon limit and bounds higher-derivative corrections via ε for finite-cutoff models.
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.
Effective phantom dark energy is a background-level reconstruction that does not imply fundamental pathologies such as ghost instabilities or null energy condition violation by the underlying stress tensor.
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.
Three H(z) parametrizations in f(R, L_m) = R/2 + L_m^λ gravity are constrained via chi-squared minimization on CC and CC+Pantheon data, with derived quantities for deceleration, EoS, energy conditions, statefinders, and thermodynamics shown to be consistent with observations.
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.
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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.