Astrophysics
[Submitted on 1 Jun 2007 (v1), last revised 21 Aug 2007 (this version, v2)]
Title:Neutrino number asymmetry and cosmological birefringence
View PDFAbstract: We study a new type of effective interactions in terms of the $CPT$-even dimension-six Chern-Simons-like term, which could originate from superstring theory, to generate the cosmological birefringence. We use the neutrino number asymmetry to induce a sizable rotation polarization angle in the data of the cosmic microwave background radiation polarization. The combined effect of the new term and the neutrino asymmetry provides an alternative way to understand the birefringence.
Submission history
From: C. Q. Geng [view email][v1] Fri, 1 Jun 2007 07:04:52 UTC (9 KB)
[v2] Tue, 21 Aug 2007 01:30:46 UTC (10 KB)
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