Work

Parity-odd CMB Correlations induced by a Chiral Gravitational Wave Background

Year: 2026

Type: preprint

Abstract: We investigate weak lensing effects of a chiral gravitational wave background (GWB) as a new mechanism for generating parity-odd correlations in the cosmic microwave background (CMB). Accounting for both photon deflection and polarization rotation, we derive the resulting parity-odd EB and TB angular power spectra. For representative GWB energy density spectra, we find parameter choices that provide good fits to existing measurements. This mechanism provides a potential observational probe of chiral GWB, which can arise in a wide range of theoretical scenarios.

Source: arXiv (Cornell University)

DOI: 10.48550/arxiv.2610.29182

Authors: Xu, Baoyu, Zhang, Yun-Long

Institutions: Chinese Academy of Sciences, National Astronomical Observatories, University of Chinese Academy of Sciences

Language: English

Topic: Cosmology and Gravitation Theories

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Natural Science Foundation of China, National Astronomical Observatories, Chinese Academy of Sciences

Awards: G2080064071, G3514763890, G3821615989

OpenAlex ID: W7223248691

Cites: 38

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Related to: 10