Curvaton as dark matter with secondary inflation

Jinn Ouk Gong, Naoya Kitajima, Takahiro Terada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We consider a novel cosmological scenario in which a curvaton is long-lived and plays the role of cold dark matter (CDM) in the presence of a short, secondary inflation. Non-trivial evolution of the large scale cosmological perturbation in the curvaton scenario can affect the duration of the short term inflation, resulting in the inhomogeneous end of inflation. Non-linear parameters of the curvature perturbation are predicted to be fNL,5/4 and gNL 0. The curvaton abundance can be well diluted by the short-term inflation and accordingly, it does not have to decay into the Standard Model particles. Then the curvaton can account for the present CDM with the isocurvature perturbation being sufficiently suppressed because both the adiabatic and CDM isocurvature perturbations have the same origin. As an explicit example, we consider the thermal inflation scenario and a string axion as a candidate for this curvaton-dark matter. We further discuss possibilities to identify the curvaton-dark matter with the QCD axion.

Original languageEnglish
Article number053
JournalJournal of Cosmology and Astroparticle Physics
Volume2017
Issue number3
DOIs
Publication statusPublished - 2017 Mar 27
Externally publishedYes

Keywords

  • cosmological perturbation theory
  • physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Fingerprint Dive into the research topics of 'Curvaton as dark matter with secondary inflation'. Together they form a unique fingerprint.

  • Cite this