Cosmic birefringence fluctuations and cosmic microwave background B-mode polarization

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Title:	Cosmic birefringence fluctuations and cosmic microwave background B-mode polarization
Authors:	Lee, Seokcheon;Liu, Guo-Chin;Ng, Kin-Wang
Date:	2015-06-30
Issue Date:	2016-01-06 11:03:45 (UTC+8)
Publisher:	Elsevier BV * North-Holland
Abstract:	Recently, BICEP2 measurements of the cosmic microwave background (CMB) B-mode polarization has indicated the presence of primordial gravitational waves at degree angular scales, inferring the tensor-to-scalar ratio of r=0.2 and a running scalar spectral index. In this {\em Letter}, we show that the existence of the fluctuations of cosmological birefringence can give rise to CMB B-mode polarization that fits BICEP2 data with r<0.11 and no running of the scalar spectral index. Thus, it might be too hasty to conclude that many inflation models with small r are ruled out based on BICEP2 result.
Relation:	Physics Letters B 746, p.406-409
DOI:	10.1016/j.physletb.2015.05.038
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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