PreprintarXiv licencearXiv
Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves
Abstract
Parity violation in the early Universe may lead to a chiral gravitational wave background. We show that, for finite-time parity-violating sources, the low-frequency tail of the generated chiral gravitational wave background is universally unpolarized, and that the chirality fraction decreases linearly with frequency. Our result generally applies to any parity-violating gravitational-wave source that appears quadratically in the wave equation. We consider both Gaussian sources and explicit trispectrum templates. We attribute the lack of chirality of the low-frequency tail to the fact that, on large scales, gravitational wave generation is almost equally inefficient for both helicities.
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BibTeX
@misc{chabour2026unpolarized,
title = {{Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves}},
author = {Tikinas Chabour and Guillem Domènech and Alexander Ganz and Jan Tränkle},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.28828},
eprint = {2609.28828},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.28828},
}
RIS
TY - UNPB
TI - Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves
AU - Tikinas Chabour
AU - Guillem Domènech
AU - Alexander Ganz
AU - Jan Tränkle
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2609.28828
UR - https://arxiv.org/abs/2609.28828
AB - Parity violation in the early Universe may lead to a chiral gravitational wave background. We show that, for finite-time parity-violating sources, the low-frequency tail of the generated chiral gravitational wave background is universally unpolarized, and that the chirality fraction decreases linearly with frequency. Our result generally applies to any parity-violating gravitational-wave source that appears quadratically in the wave equation. We consider both Gaussian sources and explicit trispectrum templates. We attribute the lack of chirality of the low-frequency tail to the fact that, on large scales, gravitational wave generation is almost equally inefficient for both helicities.
ER -