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Title: Curvaton as dark matter with secondary inflation

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 f {sub NL} ≈ 5/4 and g {sub NL} ≈ 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.

Authors:
;  [1];  [2]
  1. Asia Pacific Center for Theoretical Physics, Pohang 37673 (Korea, Republic of)
  2. Korea Institute for Advanced Study, Seoul 02455 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22679952
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; AXIONS; COSMOLOGICAL MODELS; DISTURBANCES; EVOLUTION; INFLATIONARY UNIVERSE; NONLINEAR PROBLEMS; NONLUMINOUS MATTER; PARTICLE DECAY; PERTURBATION THEORY; QUANTUM CHROMODYNAMICS; STANDARD MODEL

Citation Formats

Gong, Jinn-Ouk, Kitajima, Naoya, and Terada, Takahiro, E-mail: jinn-ouk.gong@apctp.org, E-mail: naoya.kitajima@apctp.org, E-mail: terada@kias.re.kr. Curvaton as dark matter with secondary inflation. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/03/053.
Gong, Jinn-Ouk, Kitajima, Naoya, & Terada, Takahiro, E-mail: jinn-ouk.gong@apctp.org, E-mail: naoya.kitajima@apctp.org, E-mail: terada@kias.re.kr. Curvaton as dark matter with secondary inflation. United States. doi:10.1088/1475-7516/2017/03/053.
Gong, Jinn-Ouk, Kitajima, Naoya, and Terada, Takahiro, E-mail: jinn-ouk.gong@apctp.org, E-mail: naoya.kitajima@apctp.org, E-mail: terada@kias.re.kr. Wed . "Curvaton as dark matter with secondary inflation". United States. doi:10.1088/1475-7516/2017/03/053.
@article{osti_22679952,
title = {Curvaton as dark matter with secondary inflation},
author = {Gong, Jinn-Ouk and Kitajima, Naoya and Terada, Takahiro, E-mail: jinn-ouk.gong@apctp.org, E-mail: naoya.kitajima@apctp.org, E-mail: terada@kias.re.kr},
abstractNote = {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 f {sub NL} ≈ 5/4 and g {sub NL} ≈ 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.},
doi = {10.1088/1475-7516/2017/03/053},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2017,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}