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

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

Creative Interdisciplinary Research Division

Research output: Contribution to conference › Paper › peer-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 language	English
Pages	259-262
Number of pages	4
Publication status	Published - 2009 Dec 1
Event	19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009 - Tokyo, Japan Duration: 2009 Nov 30 → 2009 Dec 4

Other

Other	19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009
Country/Territory	Japan
City	Tokyo
Period	09/11/30 → 09/12/4

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

Cite this

Non-gaussianity in cosmic microwave background temperature fluctuations from cosmic (super-)strings. / Naruko, Atsushi; Takahashi, Keitaro; Sendouda, Yuuiti; Yamauchi, Daisuke; Yoo, Chul Moon; Sasaki, Misao.

2009. 259-262 Paper presented at 19th Workshop on General Relativity and Gravitation in Japan, JGRG 2009, Tokyo, Japan.

Research output: Contribution to conference › Paper › peer-review

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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.",

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AU - Naruko, Atsushi

AU - Takahashi, Keitaro

AU - Sendouda, Yuuiti

AU - Yamauchi, Daisuke

AU - Yoo, Chul Moon

AU - Sasaki, Misao

PY - 2009/12/1

Y1 - 2009/12/1

N2 - 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.

AB - 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.

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

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