On the CMB kurtosis from cosmic strings.

Details On the CMB kurtosis from cosmic strings. On the CMB kurtosis from cosmic strings.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apl%26c..33...25g&link_type=abstract

Astrophysical Letters and Communications, Vol. 33, Nos. 1 - 5, p. 25 - 31

Astronomy and Astrophysics

Astrophysics

Cosmic Microwave Background: Cosmic Strings

Scientific paper

The author reports on some recent work based on a simple analytical model for computing correlations in the Cosmic Microwave Background (CMB) radiation temperature field. Under simple assumptions on the way in which CMB photons get perturbed by cosmic strings he is able to derive an expression for the q-point temperature correlation function. The analysis is sensible specially for large angular scales where the Kaiser-Stebbins effect is dominant. The author then concentrates his analysis on the excess kurtosis parameter. He also estimates the cosmic variance for the kurtosis due to a Gaussian fluctuation field, showing its dependence on the primordial spectral index of density fluctuations n and finding agreement with previous published results for the particular case of a flat Harrison-Zel'dovich spectrum.

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