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This study demonstrates that parity-violating primordial scalar trispectra, which represent deviations from mirror symmetry in the early universe, leave detectable signatures in scalar-induced gravitational waves (SIGW). The researchers show that these gravitational waves exhibit measurable chirality (handedness) that directly traces parity-violation in primordial non-Gaussianity, providing a new observational tool to constrain theories that violate parity symmetry. The analysis reveals that over certain scales, SIGW can quantify parity-violation without interference from Gaussian contributions, allowing for stringent constraints on the parity-odd component of the trispectrum.
Why it matters
This work establishes a novel connection between gravitational wave observations and fundamental symmetry violations in the early universe. The findings provide a new observational pathway to test theories of the primordial universe and distinguish between competing models of inflation and early-universe physics through future gravitational wave detectors.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Abstract: Parity-violation leaves tell-tale trails in many cosmological observables. We illustrate parity-odd primordial scalar trispectra, that despite being of modest strength, impart detectable chirality to scalar-induced gravitational waves (SIGW). This allows us to impose strong bounds on the parity-odd part of trispectrum. Over certain scales, we find SIGW directly quantify parity-violation in primordial non-Gaussianity, unobscured by the Gaussian contribution. Our results call for treatment of SIGW and parity-odd trispectrum as complementary predictions of parity-violating theories.