New exact charged black hole solutions in (2+1)D f(Q) gravity with cubic form yield a novel AdS solution without GR counterpart, with multiple horizons, stable thermodynamics, and stable photon orbits.
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Sign-switching dark energy with a transition at z_† fits recent DESI DR2, Planck CMB, and Pantheon+ data better than ΛCDM while raising the inferred Hubble constant and easing the Hubble tension.
A Gaussian three-form dark-energy model is viable and mildly preferred over ΛCDM only for the tensioned CMB+BAO+Pantheon+SH0ES combination, with a phantom dip at intermediate redshifts.
Power-law and logarithmic coupling models in covariant f(Q) gravity reproduce radiation, matter, and dark energy eras through dynamical systems analysis of critical points and their stability.
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3-dimensional charged black holes in $f({Q})$ gravity
New exact charged black hole solutions in (2+1)D f(Q) gravity with cubic form yield a novel AdS solution without GR counterpart, with multiple horizons, stable thermodynamics, and stable photon orbits.
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Sign-Switching Dark Energy: Smooth Transitions with Recent DESI DR2 Observations
Sign-switching dark energy with a transition at z_† fits recent DESI DR2, Planck CMB, and Pantheon+ data better than ΛCDM while raising the inferred Hubble constant and easing the Hubble tension.
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Three-form dark energy: constraints and multi-probe comparison with $\Lambda$CDM
A Gaussian three-form dark-energy model is viable and mildly preferred over ΛCDM only for the tensioned CMB+BAO+Pantheon+SH0ES combination, with a phantom dip at intermediate redshifts.
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Dynamical analysis of the covariant $f(Q)$ gravity models
Power-law and logarithmic coupling models in covariant f(Q) gravity reproduce radiation, matter, and dark energy eras through dynamical systems analysis of critical points and their stability.