Peakpeak correlations in the cosmic background radiation from cosmic strings
Abstract
We examine the twopoint correlation function 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 KaiserStebbins effect. We demonstrate that one can detect the imprint of cosmic strings with tension Gμ ≳ 1.2 × 10^{8} on noiseless 1 arcmin resolution cosmic microwave background (CMB) maps at 95 per cent confidence interval. Including the effects of foregrounds and anticipated systematic errors increases the lower bound to Gμ ≳ 9.0 × 10^{8} at 2σ confidence level. Smearing by beams of the order of 4 arcmin degrades the bound further to Gμ ≳ 1.6 × 10^{7}. Our results indicate that twopoint statistics are more powerful than onepoint statistics (e.g. number counts) for identifying the nonGaussianity in the CMB due to straight cosmic strings.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 October 2013
 DOI:
 10.1093/mnras/stt1284
 arXiv:
 arXiv:1212.0964
 Bibcode:
 2013MNRAS.434.3597M
 Keywords:

 cosmic background radiation;
 cosmology: theory;
 early Universe;
 largescale structure of Universe;
 Astrophysics  Cosmology and Extragalactic Astrophysics;
 Physics  Data Analysis;
 Statistics and Probability
 EPrint:
 11 pages, 7 figures and 1 table