Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2016/10/042
Keywords
Cosmic strings; domain walls; monopoles; cosmological parameters from CMBR; physics of the early universe; cosmological phase transitions
Funding
- Swiss National Supercomputing Centre (CSCS) [s319, s546]
- STFC
- Capital Fund of BIS
- Ministerio de Economia y Competitividad [FPA2015-64041-C2-1-P]
- Consolider Ingenio Programme EPI [CSD2010-00064]
- Swiss NSF
- Science and Technology Facilities Council [ST/L000504/1]
- STFC [ST/G000573/1, ST/J005673/1, ST/L000504/1, ST/K00333X/1, ST/M00418X/1, ST/M007065/1, ST/L000636/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/L000636/1, ST/J005673/1, ST/G000573/1, ST/M00418X/1, ST/M007065/1, ST/K00333X/1, ST/L000504/1] Funding Source: researchfish
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We present cosmic microwave background (CMB) power spectra from recent numerical simulations of cosmic strings in the Abelian Higgs model and compare them to CMB power spectra measured by Planck. We obtain revised constraints on the cosmic string tension parameter G mu. For example, in the Lambda CDM model with the addition of strings and no primordial tensor perturbations, we find G mu<2.0x10(-7) at 95% confidence, about 20% lower than the value obtained from previous simulations, which had 1/64 of the spatial volume. The increased computational volume also makes possible to simulate fully the physical equations of motion, in which the string cores shrink in comoving coordinates. We find however that this, and the larger dynamic range, changes the amplitude of the power spectra by only about 10%. The main cause of the stronger constraints on G mu is instead an improved treatment of the string evolution across the radiation-matter transition.
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