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Cosmic (Super)String Constraints from 21 cm Radiation



Cosmic (Super)String Constraints from 21 cm Radiation



Physical Review Letters 100(9): 091302



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 > or =30. Future experiments can exploit this effect to constrain the cosmic string tension G mu and probe virtually the entire brane inflation model space allowed by current observations. Although current experiments with a collecting area of approximately 1 km2 will not provide any useful constraints, future experiments with a collecting area of 10(4)-10(6) km2 covering the cleanest 10% of the sky can, in principle, constrain cosmic strings with tension G mu > or = 10(-10)-10(-12) (superstring/phase transition mass scale >10(13) GeV).

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Accession: 052367168

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PMID: 18352691

DOI: 10.1103/PhysRevLett.100.091302


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