Cosmology and the massive photon frequency shift in the Standard-Model Extension

TL;DR

This paper explores how a massive photon within the Standard-Model Extension framework can explain cosmological redshift phenomena and mimic dark energy effects without requiring a cosmological constant.

Contribution

It introduces a model where massive photons and Lorentz-violating fields account for redshift and dark energy-like effects in cosmology, extending previous theories.

Findings

Massive photons cause a static frequency shift depending on Lorentz-violating fields.

The model explains the disappearance of the luminosity-redshift discrepancy in certain cosmological scenarios.

Massive photons act as an effective optical dark energy without affecting cosmic dynamics.

Abstract

The total red shift $z$ might be recast as a combination of the expansion red shift and a static shift due to the energy-momentum tensor non-conservation of a photon propagating through Electro-Magnetic (EM) fields. If massive, the photon may be described by the de Broglie-Proca (dBP) theory which satisfies the Lorentz(-Poincar\'e) Symmetry (LoSy) but not gauge-invariance. The latter is regained in the Standard-Model Extension (SME), associated with LoSy Violation (LSV) that naturally dresses photons of a mass. The non-conservation stems from the vacuum expectation value of the vector and tensor LSV fields. The final colour (red or blue) and size of the static shift depend on the orientations and strength of the LSV and EM multiple fields encountered along the path of the photon. Turning to cosmology, for a zero $\Omega_{\Lambda}$ energy density, the discrepancy between luminosity and red shift distances of SNeIa disappears thanks to the recasting of $z$. Massive photons induce an effective dark energy acting `optically' but not dynamically.