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Fate of $Z_2$ Symmetric Scalar Field

The evolution of a coherently oscillating scalar field with $Z_2$ symmetry is studied in detail. We calculate the dissipation rate of the scalar field based on the closed time path formalism. Consequently, it is shown that the energy density of the coherent oscillation can be efficiently dissipated if the coupling constant is larger than the critical value, even though the scalar particle is stable due to the $Z_2$ symmetry.

preprint2013arXivOpen access
Kyohei MukaidaKazunori NakayamaMasahiro Takimoto
astro-ph.COhep-ph
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Kyohei MukaidaKazunori NakayamaMasahiro Takimoto

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