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New CMB constraints for Abelian Higgs cosmic strings
journal contribution
posted on 2023-06-09, 11:31 authored by Joanes Lizarraga, Jon Urrestilla, David Daverio, Mark HindmarshMark Hindmarsh, Martin KunzWe 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 Gµ. For example, in the ?CDM model with the addition of strings and no primordial tensor perturbations, we find Gµ < 2.0 × 10-7 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 it 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 Gµ is instead an improved treatment of the string evolution across the radiation-matter transition.
Funding
Theoretical Particle Physics Consortium Sussex - Royal Holloway; G1449; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000504/1
History
Publication status
- Published
File Version
- Accepted version
Journal
Journal of Cosmology and Astroparticle PhysicsISSN
1475-7516Publisher
IOP PublishingExternal DOI
Issue
10Volume
2016Page range
042Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2018-01-11First Open Access (FOA) Date
2018-01-11First Compliant Deposit (FCD) Date
2018-01-11Usage metrics
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