CMB polarization power spectra contributions from a network of cosmic strings
- Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH (United Kingdom)
- Departement de Physique Theorique, Universite de Geneve, 1211 Geneva 4 (Switzerland)
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{sup -6} (where G is the gravitational constant), above which it is likely that a detection would be possible.
- OSTI ID:
- 21027564
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 76, Issue 4; Other Information: DOI: 10.1103/PhysRevD.76.043005; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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