Gravitational redshift and the vacuum index of refraction

TL;DR

This paper proposes a model where gravitational redshift is explained through a gravitational index of refraction affecting the local speed of light, based on an aether model with photons as solitons.

Contribution

It introduces a novel approach linking gravitational potential to the local speed of light via a gravitational index of refraction within an aether framework.

Findings

Derives a gravitational index of refraction nG as a function of potential U

Shows gravitational redshift is mediated by local speed of light c

Proposes photons propagate as solitons in the aether model

Abstract

A physical process of the gravitational redshift was described in an earlier paper (Wilhelm & Dwivedi 2014) that did not require any information for the emitting atom neither on the local gravitational potential U nor on the speed of light c. Although it could be shown that the correct energy shift of the emitted photon resulted from energy and momentum conservation principles and the speed of light at the emission site, it was not obvious how this speed is controlled by the gravitational potential. The aim of this paper is to describe a physical process that can accomplish this control. We determine the local speed of light c by deducing a gravitational index of refraction nG as a function of the potential U assuming a specific aether model, in which photons propagate as solitons. Even though an atom cannot locally sense the gravitational potential U (cf. Muller et al. 2010), the gravitational redshift will nevertheless be determined by U (cf. Wolf et al. 2010)- mediated by the local speed of light c.