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PreprintCC BY 4.0arXiv

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

  • Baoyu Xu
  • Yun-Long Zhang
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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.

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Cite

BibTeXRIS
BibTeX
@misc{xu2026parityodd,
  title = {{Parity-odd CMB Correlations induced by a Chiral Gravitational Wave Background}},
  author = {Baoyu Xu and Yun-Long Zhang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29182},
  eprint = {2610.29182},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29182},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Parity-odd CMB Correlations induced by a Chiral Gravitational Wave Background
AU  - Baoyu Xu
AU  - Yun-Long Zhang
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29182
UR  - https://arxiv.org/abs/2610.29182
AB  - 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.
ER  -