Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2011/12/021
Keywords
cosmological parameters from CMBR; Cosmic strings; domain walls; monopoles; physics of the early universe; cosmological phase transitions
Funding
- Science and Technology Facilities Council [ST/G000743/1, ST/F002858/1, ST/I000976/1]
- Swiss National Science Foundation
- Basque Government [IT-559-10]
- Spanish Ministry [FPA2009-10612]
- Spanish Consolider-Ingenio 2010 Programme CPAN [CSD2007-00042]
- SGI/Intel
- HEFCE
- Imperial College HPC facilities
- University of Sussex HPC Archimedes cluster
- Andromeda cluster of the University of Geneva
- Science and Technology Facilities Council [ST/J000353/1, ST/G000743/1, ST/I000976/1, ST/F002858/1] Funding Source: researchfish
- STFC [ST/J000353/1, ST/F002858/1, ST/G000743/1, ST/I000976/1] Funding Source: UKRI
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We present a significant update of the constraints on the Abelian Higgs cosmic string tension by cosmic microwave background (CMB) data, enabled both by the use of new high-resolution CMB data from suborbital experiments as well as the latest results of the WMAP satellite, and by improved predictions for the impact of Abelian Higgs cosmic strings on the CMB power spectra. The new cosmic string spectra [1] were improved especially for small angular scales, through the use of larger Abelian Higgs string simulations and careful extrapolation. If Abelian Higgs strings are present then we find improved bounds on their contribution to the CMB anisotropies, f(10)(AH) < 0.095, and on their tension, G mu(AH) < 0.57x10(-6), both at 95% confidence level using WMAP7 data; and f(10)(AH) < 0.048 and G mu(AH) < 0.42 x 10(-6) using all the CMB data. We also find that using all the CMB data, a scale invariant initial perturbation spectrum, n(s) = 1, is now disfavoured at 2.4 sigma even if strings are present. A Bayesian model selection analysis no longer indicates a preference for strings.
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