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Abstract:
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 ℓ≤20. By comparing with the observed temperature anisotropy, we set the normalization for the cosmic string mass per unit length μ, obtaining Gμ/c2 = 1.05-0.20+0.35×10-6, 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.
