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CMB polarization power spectra contributions from a network of cosmic strings

Neil Bevis^1,*, Mark Hindmarsh^1,†, Martin Kunz^2,‡, and Jon Urrestilla^1,§

¹Department of Physics & Astronomy, University of Sussex, Brighton, BN1 9QH, United Kingdom
²Département de Physique Théorique, Université de Genève, 1211 Genève 4, Switzerland

^*n.a.bevis@sussex.ac.uk
^†m.b.hindmarsh@sussex.ac.uk
^‡martin.kunz@physics.unige.ch
^§j.urrestilla@sussex.ac.uk

Phys. Rev. D 76, 043005 – Published 24 August, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.043005

Abstract

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 $μ$ to $G μ < 0.12 \times 10^{- 6}$ (where $G$ is the gravitational constant), above which it is likely that a detection would be possible.

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CMB polarization power spectra contributions from a network of cosmic strings

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