Signal of Cosmic Strings in Cross-Correlation of 21-cm Redshift and CMB Polarization Maps
arXiv:2205.02725 · doi:10.1088/1475-7516/2022/11/012
Abstract
We study the signal of cosmic string wakes present before the time of reionization in the cross-correlation signal of 21-cm redshift and B-mode CMB polarization maps. The specific non-Gaussian signal of strings in the position space cross-correlation maps can be extracted by means of a matched filtering analysis. Signals of strings with tension somewhat lower than those corresponding to the current upper bound can be identified when embedded in a background of Gaussian fluctuations from a Planck best-fit LCDM model.
arXiv comment11 pages, 7 figures
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