Large Angular Scale CMB Anisotropy Induced by Cosmic Strings

Details Large Angular Scale CMB Anisotropy Induced by Cosmic Strings Large Angular Scale CMB Anisotropy Induced by Cosmic Strings

1996-09-05

arxiv.org/abs/astro-ph/9609038v1

Phys.Rev.Lett.77:3061-3065,1996

Astronomy and Astrophysics

Astrophysics

4 pages, RevTeX, two postscript files, also available at http://www.damtp.cam.ac.uk/user/defects/ to appear in Physical Review

Scientific paper

10.1103/PhysRevLett.77.3061

We simulate the anisotropy in the cosmic microwave background (CMB) induced by cosmic strings. By numerically evolving a network of cosmic strings we generate full-sky CMB temperature anisotropy maps. Based on $192$ maps, we compute the anisotropy power spectrum for multipole moments $\ell \le 20$. By comparing with the observed temperature anisotropy, we set the normalization for the cosmic string mass-per-unit-length $\mu$, obtaining $G\mu/c^2=1.05 {}^{+0.35}_{-0.20} \times10^{-6}$, which is consistent with all other observational constraints on cosmic strings. We demonstrate that the anisotropy pattern is consistent with a Gaussian random field on large angular scales.

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