.png){kind=icon}
.png){kind=icon}
Return
Cosmic string parameter constraints and model analysis using small scale Cosmic Microwave Background data
.png){kind=icon}
OA
AI
DOI：10.1088/1475-7516/2011/12/021.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
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.
Keywords:
cosmological parameters from CMBR
Cosmic strings
domain walls
monopoles
physics of the early universe
cosmological phase transitions
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
IF:
5.9
Papers:
1.3W
Citations:
4.7W
View more organizations