CMB temperature trispectrum of cosmic strings

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.063505· OSTI ID:21409372

Hindmarsh, Mark; Ringeval, Christophe; Suyama, Teruaki ^[1]

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1. Department of Physics and Astronomy, University of Sussex, Brighton, BN19QH (United Kingdom)

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{sup -{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.

• OSTI ID: 21409372
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 6 Vol. 81; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COMPOSITE MODELS
CONFIGURATION
COSMOLOGY
DECAY
DISTRIBUTION FUNCTIONS
ELECTROMAGNETIC RADIATION
EXTENDED PARTICLE MODEL
FUNCTIONS
MATHEMATICAL MODELS
MICROSTRUCTURE
MICROWAVE RADIATION
PARTICLE DECAY
PARTICLE MODELS
QUARK MODEL
RADIATIONS
RELICT RADIATION
SPACE
STRING MODELS
VELOCITY