The 21 cm Signature of Shock Heated and Diffuse Cosmic String Wakes

Abstract

The analysis of the 21 cm signature of cosmic string wakes is extended in several ways. First we consider the constraints on $G\mu$ from the absorption signal of shock heated wakes laid down much later than matter radiation equality. Secondly we analyze the signal of diffuse wake, that is those wakes in which there is a baryon overdensity but which have not shock heated. Finally we compare the size of these signals compared to the expected thermal noise per pixel which dominates over the background cosmic gas brightness temperature and find that the cosmic string signal will exceed the thermal noise of an individual pixel in the Square Kilometre Array for string tensions $G\mu >2.5\times 10^{-8}$.

10 pages, 4 figures, Appendix added, version published in JCAP

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• Searching for Signatures of Cosmic String Wakes in 21cm Redshift Surveys using Minkowski Functionals
• Disruption of Cosmic String Wakes by Gaussian Fluctuations
• Extracting the Signal of Cosmic String Wakes from 21-cm Observations
• Note on Structure Formation from Cosmic String Wakes
• Information Theoretic Bounds on Cosmic String Detection in CMB Maps with Noise
• Inferring Cosmic String Tension through the Neural Network Prediction of String Locations in CMB Maps
• The Flow Around a Cosmic String, Part I: Hydrodynamic Solution
• Signal of Cosmic Strings in Cross-Correlation of 21-cm Redshift and CMB Polarization Maps
• High redshift signatures in the 21 cm forest due to cosmic string wakes
• The Global 21 cm Signal of a Network of Cosmic String Wakes
• Global 21cm Absorption Signal from Superconducting Cosmic Strings
• 21 cm Angular Spectrum of Cosmic String Loops
• Cosmic Strings-induced CMB anisotropies in light of Weighted Morphology