Polarizing primordial gravitational waves by parity violation
Anzhong Wang, Qiang Wu, Wen Zhao, and Tao Zhu
TL;DR
This paper explores how parity violation in Horava-Lifshitz gravity can lead to highly polarized primordial gravitational waves, potentially detectable through future CMB polarization measurements.
Contribution
It demonstrates that parity-violating operators in HL gravity can produce significant PGW polarization, a novel prediction linking quantum gravity theories to observable cosmological signals.
Findings
Large PGW polarization possible due to parity violation.
Modified dispersion relations induce non-adiabatic evolution.
Potential detectability in upcoming CMB experiments.
Abstract
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.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.