Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-05-19
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, RevTeX, no figures, preprint IEM-FT-55/92
Scientific paper
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 ($\beta_I,\beta_V$) 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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