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arXiv · 2609.28828

Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves

Tikinas Chabour·Guillem Domènech·Alexander Ganz·Jan Tränkle
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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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Tikinas Chabour, Guillem Domènech, Alexander Ganz, Jan Tränkle. 2026-09-23. Unpolarized Low-Frequency Tail of Causal Chiral Gravitational Waves. https://arxiv.org/abs/2609.28828

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