Cosmological CPT violating effect on CMB polarization

Details Cosmological CPT violating effect on CMB polarization Cosmological CPT violating effect on CMB polarization

Publishing date

2008-10-02

URL

arxiv.org/abs/0810.0403v2

Journals

Phys.Rev.D78:103516,2008

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info

12 pages

Type

Scientific paper

Digital Object Identifier

10.1103/PhysRevD.78.103516

Abstract

A dark energy scalar (or a function of the Ricci scalar) coupled with the derivative to the matter fields will violate the $CPT$ symmetry during the expansion of the Universe. This type of cosmological $CPT$ violation helps to generate the baryon number asymmetry and gives rise to the rotation of the photon polarization which can be measured in the astrophysical and cosmological observations, especially the experiments of the cosmic microwave background radiation. In this paper, we derive the rotation angle in a fully general relativistic way and present the rotation formulas used for the cosmic microwave background data analysis. Our formulas include the corrections from the spatial fluctuations of the scalar field. We also estimate the magnitude of these corrections in a class of dynamical dark energy models for quintessential baryo/leptogenesis.

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