Polarizing primordial gravitational waves by parity violation
Cosmology and Nongalactic Astrophysics2014-11-10v3General Relativity and Quantum CosmologyHigh Energy Physics - PhenomenologyHigh Energy Physics - Theory
We study primordial gravitational waves (PGWs) in the Horava-Lifshitz (HL) theory of quantum gravity, in which high-order spatial derivative operators, including the ones violating parity, generically appear in order for the theory to be power-counting renormalizable and ultraviolet (UV) complete. Because of both parity violation and non-adiabatic evolution of the modes due to a modified dispersion relationship, a large polarization of PGWs becomes possible, and it could be well within the range of detection of the BB, TB and EB power spectra of the forthcoming cosmic microwave background (CMB) observations.
@article{arxiv.1208.5490,
title = {Polarizing primordial gravitational waves by parity violation},
author = {Anzhong Wang and Qiang Wu and Wen Zhao and Tao Zhu},
journal= {arXiv preprint arXiv:1208.5490},
year = {2014}
}