Fitting BICEP2 with defects, primordial gravitational waves and dust

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Lizarraga , J , Urrestilla , J , Daverio , D , Hindmarsh , M , Kunz , M & Liddle , A R 2015 , ' Fitting BICEP2 with defects, primordial gravitational waves and dust ' , Journal of Physics : Conference Series , vol. 600 , 012025 . https://doi.org/10.1088/1742-6596/600/1/012025

Title: Fitting BICEP2 with defects, primordial gravitational waves and dust
Author: Lizarraga, Joanes; Urrestilla, Jon; Daverio, David; Hindmarsh, Mark; Kunz, Martin; Liddle, Andrew R.
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2015
Language: eng
Number of pages: 6
Belongs to series: Journal of Physics : Conference Series
ISSN: 1742-6588
URI: http://hdl.handle.net/10138/161983
Abstract: In this work we discuss the possibility of cosmic defects being responsible for the B-mode signal measured by the BICEP2 collaboration. We also allow for the presence of other cosmological sources of B-modes such as inflationary gravitational waves and polarized dust foregrounds, which might contribute to or dominate the signal. On the one hand, we find that defects alone give a poor fit to the data points. On the other, we find that defects help to improve the fit at higher multipoles when they are considered alongside inflationary gravitational waves or polarized dust. Finally, we derive new defect constraints from models combining defects and dust. This proceeding is based on previous works [1, 2].
Subject: 115 Astronomy, Space science
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