A first-order perturbative framework shows which higher-curvature terms can deform Schwarzschild black holes and predicts shifts in horizon, ISCO, photon sphere, and shadow for a power-law Gauss-Bonnet model.
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Tensor perturbations in F(T,T_G) teleparallel gravity produce gravitational waves that propagate at the speed of light, with a modified amplitude.
Fitting the one-parameter Mukherjee dark-energy EoS to Planck, DESI DR1 BAO and PantheonPlus/SH0ES data gives a weak Bayesian preference (lnB=1.8) for phantom DE with n=3.30±0.11 and w0=-1.047±0.016.
The paper claims that enforcing four-velocity normalization makes modified-gravity field equations independent of the matter-Lagrangian choice, with illustrative compact-star and cosmology results.
Einstein-Gauss-Bonnet inflation can yield positive spectral-index running with a viable era under ACT-like hints, while scalar-field and F(R) models largely cannot.
MCMC analysis of sixteen ghost-free f(R,G) inflation models shows all reproduce ns ≈ 0.97 at 60 e-folds with stable μ ≈ 0.1, preference set by Hubble parametrization.
Barrow holographic dark energy with a Hubble-horizon cutoff, embedded in f(Q,T) gravity, can fit late-time cosmological data, but the best fit is far worse than ΛCDM and the reported H0 values are inconsistent.
Einstein Gauss-Bonnet inflation can have gravitational wave speed equal to light speed and can match Planck 2018 data when the scalar-GB coupling satisfies \ddotξ = H\dotξ and the potential is a tuned power law.
A constant-jerk Hubble law is fitted to cosmic chronometer and Pantheon data, then used to evaluate three f(Q) gravity models, yielding acceleration, quintessence or phantom EoS, and SEC violation.
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Perturbative vacuum constraints in higher-curvature gravity: Schwarzschild deformations and strong-field observables
A first-order perturbative framework shows which higher-curvature terms can deform Schwarzschild black holes and predicts shifts in horizon, ISCO, photon sphere, and shadow for a power-law Gauss-Bonnet model.
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Ambiguity in matter sector for modified gravity involving $\delta^2 \mathcal{L}_{m}/\delta g^{\mu\nu}\delta g^{\alpha\beta}$ and its implications to astrophysics and cosmology
The paper claims that enforcing four-velocity normalization makes modified-gravity field equations independent of the matter-Lagrangian choice, with illustrative compact-star and cosmology results.
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ACT Data and Positive Running of the Spectral Index for Scalar Theory and Modified Gravity
Einstein-Gauss-Bonnet inflation can yield positive spectral-index running with a viable era under ACT-like hints, while scalar-field and F(R) models largely cannot.
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String-inspired Gauss-Bonnet Gravity Inflation and ACT
MCMC analysis of sixteen ghost-free f(R,G) inflation models shows all reproduce ns ≈ 0.97 at 60 e-folds with stable μ ≈ 0.1, preference set by Hubble parametrization.