CMB temperature trispectrum of cosmic strings

Hindmarsh, Mark, Ringeval, Christophe and Suyama, Teruaki (2010) CMB temperature trispectrum of cosmic strings. Physical Review D, 81 (6). ISSN 1550-7998

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We provide an analytical expression for the trispectrum of the cosmic microwave background (CMB) temperature anisotropies induced by cosmic strings. Our result is derived for the small angular scales under the assumption that the temperature anisotropy is induced by the Gott-Kaiser-Stebbins effect. The trispectrum is predicted to decay with a noninteger power-law exponent l(-rho) with 6 < rho < 7, depending on the string microstructure, and thus on the string model. For Nambu-Goto strings, this exponent is related to the string mean square velocity and the loop distribution function. We then explore two classes of wave number configuration in Fourier space, the kite and trapezium quadrilaterals. The trispectrum can be of any sign and appears to be strongly enhanced for all squeezed quadrilaterals.

Item Type: Article
Additional Information: Article Number: 063505
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Mark Hindmarsh
Date Deposited: 06 Feb 2012 20:00
Last Modified: 03 Jul 2019 01:18

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