CMB polarization power spectra contributions from a network of cosmic strings

Bevis, Neil, Hindmarsh, Mark, Kunz, Martin and Urrestilla, Jon (2007) CMB polarization power spectra contributions from a network of cosmic strings. Physical Review D, 76 (4). ISSN 0556-2821

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We present the first calculation of the possible (local) cosmic string contribution to the cosmic microwave background polarization spectra from simulations of a string network (rather than a stochastic collection of unconnected string segments). We use field-theory simulations of the Abelian Higgs model to represent local U(1) strings, including their radiative decay and microphysics. Relative to previous estimates, our calculations show a shift in power to larger angular scales, making the chance of a future cosmic string detection from the B-mode polarization slightly greater. We explore a future ground-based polarization detector, taking the CLOVER project as our example. In the null hypothesis (that cosmic strings make a zero contribution) we find that CLOVER should limit the string tension mu to G mu < 0.12x10(-6) (where G is the gravitational constant), above which it is likely that a detection would be possible.

Item Type: Article
Additional Information: Article Number: 043005
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Mark Hindmarsh
Date Deposited: 06 Feb 2012 19:07
Last Modified: 03 Jul 2019 00:21

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