Fate of Z2 symmetric scalar field

Kyohei Mukaida, Kazunori Nakayama, Masahiro Takimoto

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The evolution of a coherently oscillating scalar field with Z2 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 Z2 symmetry.

Original languageEnglish
Article number53
JournalJournal of High Energy Physics
Issue number12
Publication statusPublished - 2013 Dec


  • Cosmology of Theories beyond the SM
  • Thermal Field Theory


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