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

TL;DR

This paper investigates how a CPT-even Chern-Simons-like term, involving Kalb-Ramond and scalar fields, can cause observable polarization rotation in cosmic microwave background radiation due to neutrino and Kalb-Ramond interactions.

Contribution

It introduces a model with dynamical Kalb-Ramond and scalar fields to explain cosmological birefringence effects on CMB polarization.

Findings

Neutrino current and Kalb-Ramond field can induce significant polarization rotation.

The model predicts measurable birefringence effects in CMB polarization.

The combined effect could be detectable with current or future observations.

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 neutrino current and Kalb-Ramond field could induce a sizable rotation polarization angle in the cosmic microwave background radiation polarization.