Cosmic (super)string constraints from 21 cm radiation

Abstract

We calculate the contribution of cosmic strings arising from a phase transition in the early universe, or cosmic superstrings arising from brane inflation, to the cosmic 21 cm power spectrum at redshifts z > 30. Future experiments can exploit this effect to constrain the cosmic string tension Gu and probe virtually the entire brane inflation model space allowed by current observations. Although current experiments with a collecting area of ~ 1 km^2 will not provide any useful constraints, future experiments with a collecting area of 10^4-10^6 km^2 covering the cleanest 10% of the sky can in principle constrain cosmic strings with tension Gu > 10^(-10) to 10^(-12) (superstring/phase transition mass scale >10^13 GeV).

Accepted for publication in PRL

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Cited by in corpus (28)

• 21-cm cosmology
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• New limits on cosmic strings from gravitational wave observation
• Constraints on cosmic string tension imposed by the limit on the stochastic gravitational wave background from the European Pulsar Timing Array
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• The 21 cm Signature of Cosmic String Wakes
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• Killing vectors and anisotropy
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• Angular Power Spectrum of B-mode Polarization from Cosmic String Wakes