Neutrino number asymmetry and cosmological birefringence

Abstract

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.

8 pages, version to be published in JCAP

References in corpus (1)

• Spectral Dependence of CMB Polarization and Parity

Cited by in corpus (5)

• Constraints on CPT violation from WMAP three year polarization data: a wavelet analysis
• Large-scale magnetic fields from inflation due to Chern-Simons-like effective interaction
• Hypermagnetic Baryogenesis
• $CPT$ Violating Electrodynamics and Chern-Simons Modified Gravity
• Cosmological birefringence induced by neutrino current