Cosmological birefringence due to CPT-even Chern–Simons-like term with Kalb–Ramond and scalar fields

Shih-Hao Ho,C. Q. Geng,Kazuharu Bamba,W. F. Kao

doi:10.1140/epjc/s10052-015-3426-5

Abstract

We study the CPT-even dimension-six Chern–Simons-like term by including dynamical Kalb–Ramond and scalar fields to examine the cosmological birefringence. We show that the combined effect of a neutrino current and a Kalb–Ramond field could induce a sizable rotation polarization angle in the cosmic microwave background radiation polarization.

Highlights

It has been pointed out that the Planck Surveyor [18] will reach a sensitivity of α at levels of 10−2–10−3 [19], while a dedicated future experiment on the cosmic microwave background radiation polarization would reach 10−5–10−6 αsensitivity [19].It is well known that this phenomenon can be used to test the Einstein equivalence principle as was first pointed out by Ni [20,21]
We extend the study in Ref. [45] by considering the dynamics of a Kalb–Ramond field and a scalar field
We explore the cosmological birefringence in Sect

Summary

Introduction

It has been pointed out that the Planck Surveyor [18] will reach a sensitivity of α at levels of 10−2–10−3 [19], while a dedicated future experiment on the cosmic microwave background radiation polarization would reach 10−5–10−6 αsensitivity [19]. It is well known that this phenomenon can be used to test the Einstein equivalence principle as was first pointed out by Ni [20,21]. Another theoretical origin of the birefringence was developed by Carroll et al [1,4]. Chern–Simons-like term was considered, in which the fourvector pμ is related to a neutrino current [45] and there is a. [45] by considering the dynamics of a Kalb–Ramond field and a scalar field.

The model

Cosmological birefringence

Conclusions