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gr-qc2026
Finite-Time Bounds on Conformal Vacuum Energy Relaxation in Scalar-Tensor Gravity
Yousef Bisabr
We investigate finite time vacuum energy relaxation in conformally coupled scalar-tensor cosmology distinguishing the suppression accumulated along a physical trajectory from its a…
physics.gen-ph2026
Scalar Photon Coupling and Modified Photon Evolution: CMB Signatures and Cosmological Constraints
Y. Bisabr
We investigate the constant- limit of a photon-sector modification derived from an early-time interaction between a scalar field and radiation. Starting from the underlying scal…
gr-qc2026
Constraints on Interacting Early Dark Energy from a Modified Temperature-Redshift Relation and CMB Acoustic Scales
Y Bisabr
The Hubble tension, reflecting a persistent discrepancy between early- and late-time determinations of the Hubble constant, continues to motivate extensions of the standard cosmolo…