Axions with Variable Masses
Abstract
Axions with variable masses, in the context of a scalar--tensor gravity theory, give a large entropy production during the matter era. The subsequent axion dilution is proportional to their present energy density. Depending on the parameters (βI,βV) of the model, this dilution relaxes or even eludes the cosmological bound on the axion mass, therefore opening the so--called ``axion window".
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