Observables in theories with a varying fine structure constant

Abstract

We show how two seemingly different theories with a scalar multiplicative coupling to electrodynamics are actually two equivalent parametrisations of the same theory: despite some differences in the interpretation of some phenemenological aspects of the parametrisations, they lead to the same physical observables. This is illustrated on the interpretation of observations of the Cosmic Microwave Background.

arXiv comment14 pages, matched published version

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Cited by in corpus (7)

• Testing the violation of the equivalence principle in the electromagnetic sector and its consequences in $f(T)$ gravity
• Merging matter and geometry in the same Lagrangian
• Probing variation of the fine-structure constant in runaway dilaton models using Strong Gravitational Lensing and Type Ia Supernovae
• Can galaxy clusters, type Ia supernovae and cosmic microwave background rule out a class of modified gravity theories?
• Test of the Equivalence Principle in the Dark Sector on Galactic Scales
• Galaxy clusters, cosmic chronometers and the Einstein equivalence principle
• Some cosmological consequences of a breaking of the Einstein equivalence principle