paper

Riemannian light cone from vanishing birefringence in premetric vacuum electrodynamics

arXiv:gr-qc/0409072 · doi:10.1103/PhysRevD.70.105022

Abstract

We consider premetric electrodynamics with a local and linear constitutive law for the vacuum. Within this framework, we find quartic Fresnel wave surfaces for the propagation of light. If we require vanishing birefringence in vacuum, then a Riemannian light cone is implied. No proper Finslerian structure can occur. This is generalized to dynamical equations of any order.

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