Revisiting the cosmological coherent oscillation

Details Revisiting the cosmological coherent oscillation Revisiting the cosmological coherent oscillation

2011-12-13

arxiv.org/abs/1112.2818v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 5 figures

Scientific paper

It is often the case that scalar fields are produced in the early Universe in the form of coherent oscillation. These scalar fields may have huge abundances and affect the evolution of the Universe. In particular, if the lifetime is long enough, they may cause cosmological disasters. We revisit the issue of coherent oscillation of the scalar field when it couples with another oscillating scalar field, and find a situation that the abundance, or the amplitude of the oscillation, is significantly reduced by a variant type of the adiabatic suppression mechanism. As a concrete example, it is applied to the saxion, a flat direction in the supersymmetric axion model, and we show that the cosmological saxion problem is solved in a particular setup.

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