Skewness in CMB temperature fluctuations from curved cosmic (super-)strings

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

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We compute the one-point probability distribution function of small-angle cosmic microwave background temperature fluctuations due to curved cosmic (super-)strings with a simple model of string network by performing Monte Carlo simulations. Taking into account of the correlation between the curvature and the velocity of string segments, there appear non-Gaussian features, specifically non-Gaussian tails and a skewness, in the one-point pdf. The obtained sample skewness for the conventional field-theoretic cosmic strings is g1 -0.14, which is consistent with the result reported by Fraisse et al. We also discuss the dependence of the pdf on the intercommuting probability. We find that the standard deviation of the Gaussian part increases and non-Gaussian features are suppressed as the intercommuting probability decreases. For sufficiently small intercommuting probability, the skewness is given by (a few) × 10-2.

Original languageEnglish
Article number033
JournalJournal of Cosmology and Astroparticle Physics
Volume2010
Issue number5
DOIs
Publication statusPublished - 2010 Jun 2

Keywords

  • Cosmic strings
  • Domain walls
  • Monopoles
  • Non-gaussianity

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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