Analyzes the effects of inflation on axion dilution and reheat temperature in the Universe, indicating implications for particle physics.
An era of inflation in the hot big bang can lead to a dilution of axions. Such a dilution removes the upper bound on fA, the symmetry-breaking scale at which axions are produced. The dilution may occur during or just after inflation, but in either case there is a restriction on the reheat temperature of the Universe after inflation. Hence, such a scenario for an invisible axion requires baryogenesis to occur at a low temperature.
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Dimopoulos et al. (1988) studied this question.
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