Curvature perturbation and domain wall formation with pseudo scaling scalar dynamics

Yohei Ema, Kazunori Nakayama, Masahiro Takimoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Cosmological dynamics of scalar field with a monomial potential φn with a general background equation of state is revisited. It is known that if n is smaller than a critical value, the scalar field exhibits a coherent oscillation and if n is larger it obeys a scaling solution without oscillation. We study in detail the case where n is equal to the critical value, and find a peculiar scalar dynamics which is neither oscillating nor scaling solution, and we call it a pseudo scaling solution. We also discuss cosmological implications of a pseudo scaling scalar dynamics, such as the curvature perturbation and the domain wall problem.

Original languageEnglish
Article number067
JournalJournal of Cosmology and Astroparticle Physics
Volume2016
Issue number2
DOIs
Publication statusPublished - 2016 Feb 29

Keywords

  • Cosmic strings
  • domain walls
  • monopoles
  • non-gaussianity
  • physics of the early universe

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