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- W4252272566 abstract "In this chapter, we investigate the cosmic microwave background (CMB) bispectra of the intensity (temperature) and polarization modes induced by the graviton non-Gaussianities, which arise from the parity-conserving and parity-violating Weyl cubic terms with time-dependent coupling. By considering the time-dependent coupling, we find that even in the exact de Sitter space-time, the parity violation still appears in the three-point function of the primordial gravitational waves and could become large. Through the estimation of the CMB bispectra, we demonstrate that the signals generated from the parity-conserving and parity-violating terms appear in completely different configurations of multipoles. This signal is just good evidence of the parity violation in the non-Gaussianity of primordial gravitational waves. We find that the shape of this non-Gaussianity is similar to the so-called equilateral one. We naively estimate the observational bound on the model parameters." @default.
- W4252272566 created "2022-05-12" @default.
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- W4252272566 date "2013-01-01" @default.
- W4252272566 modified "2023-09-23" @default.
- W4252272566 title "Parity Violation of Gravitons in the CMB Bispectrum" @default.
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- W4252272566 doi "https://doi.org/10.1007/978-4-431-54180-6_8" @default.
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