Can topological defects mimic the BICEP2B-mode signal?

Lizarraga, Joanes, Urrestilla, Jon, Daverio, David, Hindmarsh, Mark, Kunz, Martin and Liddle, Andrew R (2014) Can topological defects mimic the BICEP2B-mode signal? Physical Review Letters, 112 (17). ISSN 0031-9007

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We show that the B-mode polarization signal detected at low multipoles by BICEP2 cannot be entirely due to topological defects. This would be incompatible with the high-multipole B-mode polarization data and also with existing temperature anisotropy data. Adding cosmic strings to a model with tensors, we find that B modes on their own provide a comparable limit on the defects to that already coming from Planck satellite temperature data. We note that strings at this limit give a modest improvement to the best fit of the B-mode data, at a somewhat lower tensor-to-scalar ratio of r ≃ 0.15.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Billy Wichaidit
Date Deposited: 20 Dec 2017 16:37
Last Modified: 20 Dec 2017 16:37

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Project NameSussex Project NumberFunderFunder Ref
Particle Physics Theory at Royal Holloway and SussexG0742STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/J000477/1