Superadiabatic basis in cosmological particle production: Application to preheating

Yusuke Yamada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


We discuss the adiabatic basis dependence of particle number in time-dependent backgrounds. In particular, we focus on preheating after inflation, and show that, for the optimal basis, the time dependence of the produced particle number can be well approximated by a simple connection formula, which can be obtained by analysing Stokes phenomenon in given backgrounds. As we show explicitly, the simple connection formula can describe various parameter regions such as narrow and broad resonance regime in a unified manner.

Original languageEnglish
Article number009
JournalJournal of Cosmology and Astroparticle Physics
Issue number9
Publication statusPublished - 2021 Sept
Externally publishedYes


  • inflation
  • particle physics - cosmology connection
  • quantum field theory on curved space

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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