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New CMB constraints for Abelian Higgs cosmic strings

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journal contribution
posted on 2023-06-09, 11:31 authored by Joanes Lizarraga, Jon Urrestilla, David Daverio, Mark HindmarshMark Hindmarsh, Martin Kunz
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 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 Physics

ISSN

1475-7516

Publisher

IOP Publishing

Issue

10

Volume

2016

Page range

042

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-01-11

First Open Access (FOA) Date

2018-01-11

First Compliant Deposit (FCD) Date

2018-01-11

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