Journal
GENERAL RELATIVITY AND GRAVITATION
Volume 47, Issue 2, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10714-015-1855-y
Keywords
Fine structure constant variation; CMB temperature; Scalar-tensor theories; Non-minimal coupling; BSBM theory; Dilaton
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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 phenomenological aspects of the parametrisations, they lead to the same physical observables. This is illustrated on the interpretation of observations of the cosmic microwave background.
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