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2011

Parity Violation in Graviton Non-gaussianity

Soda, Jiro, Kodama, Hideo, Nozawa, Masato

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We study parity violation in graviton non-gaussianity generated during inflation.

We develop a useful formalism to calculate graviton non-gaussianity.
Using this formalism, we explicitly calculate the parity violating part of the bispectrum for primordial gravitational waves in the exact de Sitter spacetime and prove that no parity violation appears in the non-gaussianity.
We also extend the analysis to slow-roll inflation and find that the parity violation of the bispectrum is proportional to the slow-roll parameter.

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