Variable Fine Structure Constant from Maximal-Acceleration Phase Space Relativity

TL;DR

This paper introduces a new model linking maximal acceleration in phase space to variations in the fine structure constant over cosmological scales, with implications for vacuum energy dominance.

Contribution

It proposes a maximal-acceleration relativity framework in phase space that predicts variable fine structure constant influenced by cosmological redshift and cutoff scales.

Findings

Maximal proper-acceleration bound a = c^2/Λ aligns with previous predictions.

Derived an integral equation for the fine structure constant's dependence on redshift.

Explored a vacuum energy-dominated scenario with cutoff at the Planck scale.

Abstract

We presented a new physical model that links the maximum speed of light with the minimal Planck scale into a maximal-acceleration Relativity principle in the spacetime tangent bundle and in phase spaces (cotangent bundle). The maximal proper-acceleration bound is a = c^2/ \Lambda in full agreement with the old predictions of Caianiello, the Finslerian geometry point of view of Brandt and more recent results in the literature. Inspired by the maximal-acceleration corrections to the Lamb shifts of one-electron atoms by Lambiase, Papini and Scarpetta, we derive the exact integral equation that governs the Renormalization-Group-like scaling dependence of the fractional change of the fine structure constant as a function of the cosmological redshift factor and a cutoff scale L_c, where the maximal acceleration relativistic effects are dominant. A particular physical model exists dominated entirely by the vacuum energy, when the cutoff scale is the Planck scale, with \Omega_\Lambda \sim 1 . The implications of this extreme case scenario are studied.