Non-gaussianity in cosmic microwave background temperature fluctuations from cosmic (super-)strings

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

Research output: Contribution to conferencePaperpeer-review

Abstract

We compute analytically the small-scale temperature fluctuations of 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). The resultant pdf consists of a Gaussian part due to frequent scattering by long string segments and a non-Gaussian tail due to close encounters with kinks. It contains two phenomenological parameters which are determined by comparison with the result of numerical simulations for P = 1 by Fraisse et al.. We predict that the non-Gaussian feature is suppressed for small P.

Original languageEnglish
Pages259-262
Number of pages4
Publication statusPublished - 2009 Dec 1
Event19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan
Duration: 2009 Nov 302009 Dec 4

Other

Other19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
Country/TerritoryJapan
CityTokyo
Period09/11/3009/12/4

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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