論文

基本情報

氏名 山内 大介
氏名(カナ) ヤマウチ ダイスケ
氏名(英語) Yamauchi Daisuke
所属 理学部 物理学科
職名 講師
researchmap研究者コード B000327615
researchmap機関 岡山理科大学

題名

Non-Gaussan bubble in the sky

単著・共著の別

共著

著者

Kazuyuki Sugimura, Daisuke Yamauchi, Misao Sasaki

概要

We point out a possible generation mechanism of non-Gaussian bubbles in the sky due to bubble nucleation in the early universe. We consider a curvaton scenario for inflation and assume that the curvaton field ϕ, whose energy density is subdominant during inflation but which is responsible for the curvature perturbation of the universe, is coupled to another field σ which undergoes false vacuum decay through quantum tunneling. For this model, we compute the skewness of the curvaton fluctuations due to its interaction with σ during tunneling, that is, on the background of an instanton solution that describes false vacuum decay. We find that the resulting skewness of the curvaton can become large in the spacetime region inside the bubble. We then compute the corresponding skewness in the statistical distribution of the cosmic microwave background (CMB) temperature fluctuations. We find a non-vanishing skewness in a bubble-shaped region in the sky. It can be large enough to be detected in the near future, and if detected it will bring us invaluable information about the physics in the early universe.

発表雑誌等の名称

Europhysics Letters

出版者

100

2

開始ページ

終了ページ

発行又は発表の年月

2012/10

査読の有無

有り

招待の有無

無し

記述言語

英語

掲載種別

研究論文(学術雑誌)

ISSN

ID:DOI

10.1209/0295-5075/100/29004

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

1208.3937

ORCIDのPut Code

DBLP ID