Pre-metric electromagnetism as a path to unification

TL;DR

This paper proposes a novel unification of electromagnetism and gravity through a pre-metric approach, suggesting gravity emerges from electromagnetic properties of spacetime via wave dispersion laws.

Contribution

It introduces a pre-metric framework that unifies electromagnetism and gravity differently from Einstein-Maxwell theory, linking gravity to electromagnetic constitutive properties.

Findings

Electromagnetism and gravity can be unified through pre-metric spacetime properties.

Gravity emerges as a consequence of electromagnetic constitutive relations.

The dispersion law for electromagnetic waves plays a key role in this unification.

Abstract

It is shown that the pre-metric approach to Maxwell's equations provides an alternative to the traditional Einstein-Maxwell unification program, namely, that electromagnetism and gravitation are unified in a different way that makes the gravitational field a consequence of the electromagnetic constitute properties of spacetime, by way of the dispersion law for the propagation of electromagnetic waves.