1212.0964 (M. Sadegh Movahed et al.)

Peak-peak correlations in the cosmic background radiation from cosmic strings    [PDF]

M. Sadegh Movahed, B. Javanmardi, Ravi K. Sheth

We examine the two-point correlation function (TPCF) of local maxima in temperature fluctuations at the last scattering surface when this stochastic field is modified by the additional fluctuations produced by straight cosmic strings via the Kaiser-Stebbins effect. We demonstrate that one can detect the imprint of cosmic strings with tension $G\mu \gtrsim 1.2 \times 10^{-8}$ on noiseless $1^\prime$ resolution CMB maps at 95% confidence interval. Including the effects of foregrounds and anticipated systematic errors increases the lower bound to $G\mu \gtrsim 9.0\times 10^{-8}$ at $2\sigma$ confidence level. Smearing by beams of order 4' degrades the bound further to $G\mu \gtrsim 1.6 \times 10^{-7}$. Our results indicate that 2-point statistics are more powerful than 1-point statistics (e.g. number counts) for identifying the non-Gaussianity in the CMB due to straight cosmic strings.

View original: http://arxiv.org/abs/1212.0964