TL;DR
This paper identifies covariant conditions within the premetric electrodynamics framework that ensure the quartic Fresnel surface corresponds to a single light cone, eliminating birefringence in vacuum.
Contribution
It derives the covariant conditions necessary for the quartic Fresnel surface to represent a unique light cone without birefringence in vacuum within the premetric approach.
Findings
Conditions for no birefringence in vacuum derived
Quartic Fresnel surface reduces to a single light cone
Framework applicable to covariant electrodynamics
Abstract
Within the axiomatic premetric approach to classical electrodynamics, we derive under which covariant conditions the quartic Fresnel surface represents a unique light cone without birefringence in vacuum.
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