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-Gaussianity in Cosmic Microwave Background Temperature Fluctuation from Cosmic (Super-)Strings

単著・共著の別

共著

著者

Keitaro Takahashi, Atsushi Naruko, Yuuiti Sendouda, Daisuke Yamauchi, Chul-Moon Yoo, Misao Sasaki

概要

We compute analytically the small-scale temperature fluctuations of the cosmic microwave background from cosmic (super-)strings and study the dependence on the string intercommuting probability P. We develop an analytical model which describes the evolution of a string network and calculate the numbers of string segments and kinks in a horizon volume. Then we derive the probability distribution function (pdf) which takes account of finite angular resolution of observation. The resultant pdf consists of a Gaussian part due to frequent scatterings by long string segments and a non-Gaussian tail due to close encounters with kinks. The dispersion of the Gaussian part is reasonably consistent with that obtained by numerical simulations by Fraisse et al.. On the other hand, the non-Gaussian tail contains two phenomenological parameters which are determined by comparison with the numerical results for P = 1. Extrapolating the pdf to the cases with P < 1, we predict that the non-Gaussian feature is suppressed for small P.

発表雑誌等の名称

Journal of Cosmology and Astroparticle Physics

出版者

10

003

開始ページ

終了ページ

発行又は発表の年月

2009/10

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

10.1088/1475-7516/2009/10/003

ID:NAID(CiNiiのID)

ID:PMID

URL

JGlobalID

arXiv ID

0811.4698

ORCIDのPut Code

DBLP ID