Dark Energy

Mock data generated in evolving-dark-energy cosmologies, when fit under ΛCDM, reproduce the observed probe-to-probe differences in Ωm and the ~1.2 km/s/Mpc BAO H0 bias.

arxiv:2412.04430 · astro-ph.CO · 2024-12

A variable-speed-of-light model with a modified Lemaître redshift formula fits the Pantheon supernova catalog with H0 ≈ 47 and no dark energy.

arxiv:2412.05262 · astro-ph.CO · 2024-12

Derives a non-flat interacting Barrow holographic dark energy model and fits it to CC and Pantheon data, but the statistical claim of preference is contradicted by the paper's own AIC/BIC/DIC table.

arxiv:2412.05577 · gr-qc · 2024-12

The paper suggests the Higgs mass is the geometric mean of the dark energy scale and the inflation scale, but the relation is fitted rather than independently derived.

arxiv:2412.06851 · gr-qc · 2024-12

A compactified phase-space analysis of four dark matter/phantom scalar interactions shows one model avoids Big Rip singularities, one needs a small coupling to avoid them, and two have singular surfaces that make them unattractive.

arxiv:2412.06501 · gr-qc · 2024-12

Simulated 3G gravitational wave standard sirens, combined with CMB+BAO+SN data, could improve constraints on holographic dark energy parameters by 27 to 88 percent, depending on the detector network.

arxiv:2412.06873 · astro-ph.CO · 2024-12

In the far region of a Schwarzschild-de Sitter black hole, the cosmological constant can generate a seed magnetic field in a plasma through a general-relativistic battery, but the field is roughly 10^-27 times the plasma rest-mass energy density.

arxiv:2412.07516 · physics.plasm-ph · 2024-12

Redshift drift forecasts that include spatial curvature show curvature sensitivity comparable to matter density and an open/closed asymmetry, with the first joint standard-plus-differential drift constraints for the ELT Golden Sample.

arxiv:2412.07532 · astro-ph.CO · 2024-12

The fractional holographic dark energy model with the future event horizon as its length scale survives DESI DR2 plus CMB distance-prior constraints, while the Hubble-horizon and particle-horizon versions are ruled out.

arxiv:2608.09379 · gr-qc · 2026-08

A Fisher forecast shows that adding full-shape intrinsic alignment information to galaxy clustering tightens cosmological constraints, particularly for dark energy and non-flat modified-gravity models.

arxiv:2412.08151 · astro-ph.CO · 2024-12

A Fisher forecast shows that including galaxy intrinsic alignments alongside full-shape galaxy clustering improves the dark energy figure-of-merit by 42-57% and the primordial amplitude constraint by 17-19% for a PFS-like survey.

arxiv:2412.08150 · astro-ph.CO · 2024-12

Seven holographic dark energy models are constrained with DESI BAO, Planck CMB, and PantheonPlus supernovae; LambdaCDM stays preferred, Ricci dark energy is ruled out, and event-horizon models show large data-set-dependent parameter shifts.

arxiv:2412.09064 · astro-ph.CO · 2024-12

Two linear interacting dark energy models are fitted to Pantheon and OHD data, yielding opposite interaction directions depending on the dataset and an inconclusive resolution of the coincidence problem.

arxiv:2412.09024 · astro-ph.CO · 2024-12

A one-parameter modification that lets gravity differ above and below the Hubble scale fits CMB and BAO data with a preference for slightly weaker superhorizon gravity, at about 2 sigma.

arxiv:2412.09568 · astro-ph.CO · 2024-12

A photon is modeled as a dark photon plus a massless light-wave; dark photons, formed when light-waves disappear, are claimed to explain dark matter, dark energy, redshift, and other phenomena.

arxiv:2412.10661 · physics.optics · 2024-12

Entropic corrections to gravity, fitted to cosmic chronometers, BAO, and strong-lensing data, can mimic dark energy and yield H0 close to SH0ES, though the statistical evidence is weak.

arxiv:2412.11260 · gr-qc · 2024-12

A two-parameter jerk-based f(Q,T) model is fit to OHD and Pantheon data, but the Pantheon H0 constraints are artifacts and the ekpyrotic pre-Big-Bang phase is an interpretation mismatch.

arxiv:2412.12210 · gr-qc · 2024-12

Shift-symmetric Horndeski scalars with a spatial gradient realize moving dark energy, with a universal momentum density T^0i = -Q lambda^i / sqrt(-g) and observable imprints on the CMB dipole and quadrupole.

arxiv:2412.12018 · astro-ph.CO · 2024-12

A simulation forecast claims CE+ET bright standard sirens can measure dark energy EoS parameters with sigma(w0)=0.010, sigma(wa)=0.049, sigma(wb)=0.072, better than other planned probes.

arxiv:2412.12285 · astro-ph.CO · 2024-12

Reconstructing Ωm from DESI's w0waCDM fits shows an SNe-driven low-redshift departure from ΛCDM, with a 3.4σ disagreement between a DES supernova subsample and DESI full-shape clustering at the same effective redshift.

arxiv:2412.12905 · astro-ph.CO · 2024-12

A class of scalar-tensor dark energy theories with photon couplings can have luminal gravitational waves and suppressed gravitational wave decay into dark energy.

arxiv:2412.13460 · hep-th · 2024-12

A toy model of neutron stars with a dark-energy Chaplygin core and a polytropic crust can produce stable configurations that fit current mass-radius and tidal-deformability observations, though the fit is driven by free parameters.

arxiv:2412.13568 · gr-qc · 2024-12

Under the null energy condition, BAO distances can deviate from Lambda-CDM only in one direction, and DESI's main apparent tensions sit on the forbidden side.

arxiv:2412.13894 · astro-ph.CO · 2024-12

A one-parameter interacting dark sector model can shift H0 upward and S8 downward when fit to Planck, DESI and supernova data, but the Bayesian evidence over LambdaCDM is inconclusive without SH0ES calibration.

arxiv:2412.14139 · astro-ph.CO · 2024-12

Warm wave dark matter free streaming can shift by up to roughly 40% in a very early dark energy cosmology, while early matter domination moves the signal to unobservably small scales.

arxiv:2412.14322 · astro-ph.CO · 2024-12

A new gravity modification with an energy-density-dependent Einstein constant produces a logarithmic dark energy correction, but data constrain the new parameter to be zero within 1 sigma, so the model does not improve on LambdaCDM.

arxiv:2412.14747 · gr-qc · 2024-12

A composite dark energy with negative-energy phantom matter before z≈1.5 and quintessence afterward improves the fit over ΛCDM by ΔAIC≈60 and resolves both tensions with BAO 2D, but not with BAO 3D.

arxiv:2412.15124 · astro-ph.CO · 2024-12

A new Bayesian analysis of Pantheon+ supernovae reports strong statistical preference for the timescape cosmology over LambdaCDM.

arxiv:2412.15143 · astro-ph.CO · 2024-12

A perturbation-theory treatment of gravitational waves in a Robertson-Walker universe yields a next-to-leading-order correction factor to the waveform, but the quantitative expression appears to contain sign and factor errors.

arxiv:2412.15578 · gr-qc · 2024-12

A quadratic dark-sector interaction model is viable only for a narrow range of negative coupling, and with that restriction it fits cosmological data while slightly reducing the sigma8 tension.

arxiv:2412.16299 · astro-ph.CO · 2024-12

In Lovelock gravity, the flat, open, and closed Friedmann equations admit constant-curvature vacuum solutions whose scale factors are exponential, sinh, and cosh respectively, with the rate set by a polynomial in the Lovelock coupling constants.

arxiv:2412.18814 · gr-qc · 2024-12

A logarithmic q(z) ansatz fitted to OHD and Pantheon+SH0ES in f(Q,C)=gamma1 Q^2 + gamma2 C claims zt about 0.98 and 0.76, but C is dynamically irrelevant and Table I's q0 contradicts the reported q(z=0).

arxiv:2412.19852 · gr-qc · 2024-12

Accurate axion-isocurvature evolution across the full ultralight mass range converts Planck and BICEP bounds into inflation-scale limits and reveals a small discovery window near m_a ~ 10^-25 eV.

arxiv:2608.07803 · astro-ph.CO · 2026-08

Thermodynamic constraints on fΛ(t) and hB(t) in a first-law-derived cosmological model are shown to reduce to ρ ≥ 0 and w ≥ -1, so the claimed consistency with the observed cosmological constant is an artifact of setting the integration constant C = Λ/3.

arxiv:2412.19032 · gr-qc · 2024-12

Whether the data prefer dynamical dark energy depends on the assumed early-universe values of the sound horizon and matter density; early solutions to the Hubble tension move to a nexus where the preference drops below 0.5 sigma.

arxiv:2608.07654 · astro-ph.CO · 2026-08

A generalized total equation-of-state model with parameters α, β, n is fitted to H(z) and Pantheon+ data, yielding a present-day EoS near -0.7 and an apparent quintessence-like dark energy.

arxiv:2412.20073 · astro-ph.CO · 2024-12

A kinetically coupled tachyon dark energy model admits a new stable scaling attractor for a range of coupling and potential parameters, providing a mechanism to keep dark energy and dark matter densities comparable.

arxiv:2412.20118 · gr-qc · 2024-12

Black hole formation and merger, through topology changes of the cosmic apparent horizon, generate an effective dark energy whose equation of state is phantom-like or quintessence-like depending on the sign of the Gauss-Bonnet coupling.

arxiv:2412.21146 · gr-qc · 2024-12

Holographic dark energy models are formally rewritten as k-essence scalar fields, but the central reconstruction equation contains an apparent algebraic error and the 'most generalized' cutoff is not actually implemented.

arxiv:2501.04028 · physics.gen-ph · 2024-12

In f(Q) gravity, the reconstructed new agegraphic dark energy model shows quintessence-like behavior, freezing phase-plane trajectories, Chaplygin-gas statefinder behavior, and instability.

arxiv:2501.00721 · gr-qc · 2025-01

By inserting mu_D = alpha H + beta H^2 into f(Q,L_m) field equations and choosing parameters, the authors obtain a phantom-like dark energy model whose diagnostics are presented as evidence for viability.

arxiv:2501.01177 · gr-qc · 2025-01

A constant correlation between external and internal expansion rates yields exact Bianchi type-I solutions whose effective dark energy mimics a cosmological constant at late times and a steady-state universe for negative correlation.

arxiv:2501.02109 · gr-qc · 2025-01

A reanalysis of Pantheon supernova data finds residuals are better fit by a Logistic than a Gaussian distribution, shifting H0 upward and revealing survey inconsistencies.

arxiv:2501.02204 · astro-ph.CO · 2025-01

A search of archival DECam data finds no RR Lyrae variables in the ultrafaint dwarf galaxy Sextans II, despite recovering a known foreground RR Lyrae in the same images.

arxiv:2501.02160 · astro-ph.SR · 2025-01

In three new w(z)CDM parametrizations, Planck CMB plus non-CMB data favor evolving dark energy over a cosmological constant at roughly 2 sigma when the Planck lensing anomaly parameter is fixed, and at roughly 1 sigma when it is free.

arxiv:2501.03480 · astro-ph.CO · 2025-01

Bulk viscous matter in a linear f(T) gravity model is fitted to cosmic data, but the velocity-dependent viscosity case is built on an incorrect Hubble parameter solution.

arxiv:2501.03388 · astro-ph.CO · 2025-01

Peculiar motion relative to the cosmic rest frame can make a decelerating universe appear to accelerate, with a Doppler-like dipole in the deceleration parameter as the signature.

arxiv:2501.04680 · gr-qc · 2025-01

A scalar field with a 4D isotropic cutoff reduces to a 1D harmonic oscillator with vacuum energy (1/8)mΛ³, which the authors link to the observed dark energy scale via an exponential suppression factor.

arxiv:2501.05274 · hep-th · 2025-01

Modern cosmology is a successful empirical science, but the microphysical identities of inflation, dark matter, and dark energy may be permanently underdetermined by cosmological data.

arxiv:2501.06095 · physics.hist-ph · 2025-01

A comparative benchmark of six Markov Chain Monte Carlo and nested samplers finds that HMC and nested sampling perform best on complex cosmological parameter spaces, though no method dominates overall.

arxiv:2501.06022 · astro-ph.CO · 2025-01

The offset between Pantheon+ and DES-SN5YR supernova distances is explained by modeling improvements and selection-function differences, not by underestimated systematics.

arxiv:2501.06664 · astro-ph.CO · 2025-01

An inhomogeneous Lemaitre model with a space-dependent cosmological constant and a unified dark fluid can reproduce the local and early-universe Hubble constants and generates testable predictions for expansion rates and redshift drift.

arxiv:2501.07968 · gr-qc · 2025-01

A Kaniadakis entropy cosmology with neutrinos shifts H0 and S8 toward intermediate values, but the entropy parameter is consistent with zero and the tensions are not clearly resolved.

arxiv:2501.07860 · astro-ph.CO · 2025-01

Two Gong-Zhang dark-energy equation-of-state parametrizations are implemented in f(R,L_m) gravity and constrained with cosmic chronometer and Pantheon supernova data.

arxiv:2501.08161 · gr-qc · 2025-01

An f(R,T) gravity model with an assumed emergent Hubble parameter is fitted to cosmological data and used to derive dark energy diagnostics, but the fit values are not reported.

arxiv:2501.08362 · gr-qc · 2025-01

A Bayesian combination of local probes shows that a low matter density can accommodate local H0 and sigma8 values in LCDM when the BAO sound horizon is left free, but dynamical dark energy still faces tensions with Pantheon+ supernovae.

arxiv:2501.08915 · astro-ph.CO · 2025-01

A sign-switching dark-sector coupling, fitted to CMB, DESI BAO, and supernova data, can simultaneously raise H0 and lower S8, but the preference over LambdaCDM depends on using SH0ES-calibrated supernovae.

arxiv:2501.10323 · astro-ph.CO · 2025-01

A thesis that re-presents the author's prior published work, concluding that f(T,B), f(T,T_G), f(T,B,T_G,B_G), and scalar-field variants admit stable dark-energy attractors only for carefully hand-picked parameter ranges.

arxiv:2501.11048 · gr-qc · 2025-01

Constraining nDGP, k-mouflage, and phenomenological modified gravity with JWST high-redshift data yields preferred parameters, but no model fully reproduces the observed z~12 star formation rate density.

arxiv:2501.11103 · astro-ph.CO · 2025-01

New families of exact and approximate F(T) solutions are derived for scalar-field-driven Kantowski-Sachs teleparallel gravity using power-law, exponential, and logarithmic ansatze.

arxiv:2501.11160 · gr-qc · 2025-01

Cosmologists should compare clustering amplitude with the h-independent statistic sigma_12 instead of sigma_8, because sigma_8's smoothing scale shifts with H0 and artificially worsens the growth tension in high-H0 models.

arxiv:2501.11571 · astro-ph.CO · 2025-01

An exponential f(Q) gravity model, a small perturbation of ΛCDM, gives quintessence for one sign of its parameter b and phantom behavior for the other, while changing late-time structure growth.

arxiv:2501.12585 · gr-qc · 2025-01

The paper derives analytic F(T) functions for scalar-field cosmologies in flat, open, and closed teleparallel Robertson-Walker spacetimes using a power-law scale factor.

arxiv:2501.13895 · gr-qc · 2025-01

An f(T,T) gravity model with a fitted equation of state matches cosmic expansion data, giving H0=68.04, beta=0.14, gamma=0.96 and an accelerating late universe.

arxiv:2501.14908 · astro-ph.CO · 2025-01

A cuscuton-like kinetic term is combined with quintessence fields in a first-order formalism, producing analytical dark-energy histories, but the advertised phantom phases rely on an inconsistent sign choice and the AIC comparison does not actually favor the model.

arxiv:2501.14909 · astro-ph.CO · 2025-01

A review of CSST cosmological probes forecasting percent-level constraints on dark energy and dark matter from weak lensing, clustering, clusters, voids, SNe Ia, and BAO, based mostly on the authors' prior mock analyses.

arxiv:2501.15023 · astro-ph.CO · 2025-01

A forecast study claims SKA with 0.001 Hz spectral resolution could measure cosmic redshift drift at millimeter-per-second precision over 0.5 years, yielding tight dark energy constraints.

arxiv:2501.15117 · astro-ph.CO · 2025-01

With Planck and DESI BAO data, the Brans-Dicke Galileon model prefers a nonzero Galileon term and yields H0 = 71.0 +1.5 -1.3 km/s/Mpc, consistent with SH0ES at 1.2 sigma.

arxiv:2501.15298 · astro-ph.CO · 2025-01

Wald-Gauss-Bonnet topological dark energy is viable against late-universe data but statistically loses to ΛCDM, and its perturbations are nearly indistinguishable from ΛCDM.

arxiv:2501.15927 · gr-qc · 2025-01

TiDES simulations forecast over 140,000 cosmologically useful type Ia supernovae and a statistical-only dark energy equation-of-state constraint roughly 10 times tighter than DES-SN5YR.

arxiv:2501.16311 · astro-ph.HE · 2025-01

Bulk flow speeds and directions are fitted to supernova data, and the neutrino-coupled f(R) model gives the largest fitted velocities, but the claim is a comparison of fit parameters rather than a prediction.

arxiv:2501.16492 · astro-ph.CO · 2025-01

A one-parameter geometric dark energy model fits the newest DESI, Planck, ACT, and supernova data as well as or slightly better than the standard cosmological model, with a small negative extra parameter.

arxiv:2608.07313 · astro-ph.CO · 2026-08

Mock galaxy-survey analyses show that sound-horizon-free H0 measurements do not currently rule out BAO-compatible early dark energy models, and LambdaCDM-derived priors can bias the result.

arxiv:2501.16883 · astro-ph.CO · 2025-01

The paper derives field-theoretic reconstructions of Fractional Holographic Dark Energy for six scalar and gauge models, with the EoS behavior inherited from the FHDE input rather than from the field dynamics.

arxiv:2502.00292 · gr-qc · 2025-02

A claimed beyond-linear derivation of gravitational wave reflection by black holes and material interfaces rests on an incorrect Ricci-tensor variation formula.

arxiv:2502.01687 · physics.gen-ph · 2025-02

A review chapter summarizing the history, theory, and current observations of dark energy, presenting no new research results.

arxiv:2502.00923 · astro-ph.CO · 2025-02

Low-redshift large-scale structure data pull the dark-energy equation-of-state posterior toward a cosmological constant and yield S8=0.777±0.017.

arxiv:2502.01722 · astro-ph.CO · 2025-02

CMB secondary anisotropies constrain the clustered fraction in unified Chaplygin gas models to f greater than or similar to 0.99, leaving little room for deviations from LambdaCDM.

arxiv:2502.01751 · astro-ph.CO · 2025-02

The Generalized SU(2) Proca theory fails to provide a viable cosmic history because the Hubble parameter becomes undetermined or complex in the central zone of its phase space.

arxiv:2502.03483 · gr-qc · 2025-02

Two regular black hole metrics are derived from anisotropic multi-polytropic TOV equations; one reduces to the known Hayward geometry and the other is new, with repulsive-gravity regions outside the horizon for particular parameter choices.

arxiv:2502.02098 · gr-qc · 2025-02

The paper derives ΛE and a MOND acceleration a0 from the SIV gauge choice λ = t0/t, but the values come from inserting the observed age, H0, and Ωm.

arxiv:2502.02282 · astro-ph.CO · 2025-02

A sextic ghost condensate dark energy model is shown to produce a matter-density-dependent correction to the Newtonian potential and a frequency-dependent gravitational wave speed in de Sitter spacetime.

arxiv:2502.02401 · hep-th · 2025-02

BOSS full-shape data do not tighten Planck bounds on velocity-dependent dark matter-baryon scattering, but adding a DES S8 prior yields a greater than 2 sigma preference for a velocity-independent cross section and lowers the S8 tension from 2.59 sigma to 1.47 sigma.

arxiv:2502.02636 · astro-ph.CO · 2025-02

The first Dark Scattering constraints from DES Y3 plus BOSS DR12 give w = -1.04+0.10-0.08 and Ads = -0.2+4.6-5.9 b GeV^-1, consistent with no interaction while reducing S8 projection effects.

arxiv:2502.03390 · astro-ph.CO · 2025-02

Massive scalar perturbations on conformal Weyl black holes with c^2<1 and mu^2>Lambda experience a double-peak potential barrier and produce a series of late-time echoes.

arxiv:2502.03706 · gr-qc · 2025-02

The DESI dynamical dark energy preference drops below 2 sigma after correcting a 0.043 mag intercept discrepancy in the low-redshift supernovae of DESY5.

arxiv:2502.04212 · astro-ph.CO · 2025-02

With a specific choice of connection functions, Myrzakulov F(R,Q) gravity and Tsallis cosmology produce identical background expansion but different growth of density perturbations.

arxiv:2502.04462 · gr-qc · 2025-02

When the Planck lensing amplitude AL is fitted freely, DESI+CMB+SN data no longer prefer evolving dark energy, and DESI BAO's lower matter density worsens the lensing anomaly in LambdaCDM.

arxiv:2502.04641 · astro-ph.CO · 2025-02

Pantheon and H(z) data force the cosmic triad vector dark energy model to sit very close to the LambdaCDM limit.

arxiv:2502.04828 · astro-ph.CO · 2025-02

The paper obtains an exact cylindrical AdS black-string metric with string clouds and quintessence, and expresses the near-horizon scalar wave function with confluent Heun functions, identifying a quintessence-dependent dark phase.

arxiv:2502.04894 · gr-qc · 2025-02

The viability of minimally and non-minimally coupled quintessence models is robust across CPL, JBP, BA, and EXP parameterizations, with all four reproducing the models' predicted observables accurately.

arxiv:2502.04929 · astro-ph.CO · 2025-02

The paper claims black holes can trap Higgs field energy as dark energy during stellar collapse, giving a 2:1 matter-to-dark-energy ratio and a 57 microsecond collapse time.

arxiv:2502.05361 · astro-ph.CO · 2025-02

Complementary redshift cuts of DESI BAO DR2, Pantheon+ and CMB distance priors show no robust evidence for w0waCDM over Lambda-CDM, with BIC favoring Lambda-CDM.

arxiv:2608.04353 · astro-ph.CO · 2026-08

An ensemble-averaged stochastic cosmology with a 'little ado' noise term produces an emergent dark energy that fits late-time data and claims to relieve the H0 and f sigma8 tensions.

arxiv:2502.05823 · astro-ph.CO · 2025-02

3-form dark energy can explain cosmic birefringence with a dimension-4 photon coupling, yielding redshift profiles that can mimic or differ from axion dark energy, but the implied photon mass estimate is numerically shaky.

arxiv:2608.05296 · astro-ph.CO · 2026-08

Variational Bethe-Salpeter calculations predict that momentum-dark excitons and trions are the ground states in monolayer InSe, with phonon-assisted brightening producing PL spectra dominated by the negative trion at low temperatures.

arxiv:2502.06473 · cond-mat.mes-hall · 2025-02

A review that classifies modified gravity theories by the GR principles they preserve or violate, and maps their tests onto a curvature-compactness plane.

arxiv:2502.07437 · gr-qc · 2025-02

In NGVE theory's conformal geometry, the modified Raychaudhuri equation yields acceleration, collapse, or steady state depending on an interaction term f(χ).

arxiv:2502.08094 · gr-qc · 2025-02

A compilation of f(Q) and f(Q,T) gravity models that fit late-time cosmic acceleration data, reproducing quintessence, phantom, and Lambda-CDM-like behavior without a cosmological constant.

arxiv:2502.10466 · gr-qc · 2025-02

A scale-invariant dark energy model with an R^2 term produces trans-Planckian-frequency oscillations around standard cosmological evolution, damped by particle production.

arxiv:2502.08334 · gr-qc · 2025-02