Spectral Dependence of CMB Polarization and Parity

Details Spectral Dependence of CMB Polarization and Parity Spectral Dependence of CMB Polarization and Parity

2003-10-31

arxiv.org/abs/hep-ph/0310368v2

JCAP 0312 (2003) 008

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages; Uses REVTeX 4; reference added; version to appear in JCAP

Scientific paper

10.1088/1475-7516/2003/12/008

The polarization of the cosmic microwave background radiation (CMBR) can serve as a probe for nonstandard parity violating interactions. Many such interactions are predicted in particle physics models arising from theories with extra dimensions such as superstring theory. These interactions produce an optical activity that depends on the space-time nature of the parity violating field. In particular, it is possible to obtain a frequency-dependent differential rotation of the polarization axis. The form of the frequency dependence is sensitive to the time evolution of the parity odd background field. Thus, one may be able to study a broad class of parity violating operators through polarization measurements of the CMBR.

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