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:	2017-11-03 02:10:12 (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-toscalar ratio of r = 0.2 and a running scalar spectral index, provided that dust contamination is low. In this 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. When dust contribution is taken into account, we derive an upper limit on the cosmological birefringence, Aβ2 < 0.0075, where A is the amplitude of birefringence fluctuations that couple to electromagnetism with a coupling strength β.
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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