New shape for cross-bispectra in Chern-Simons gravity

Perseas Christodoulidis; Jinn Ouk Gong; Wei Chen Lin; Maria Mylova; Misao Sasaki

doi:10.1088/1475-7516/2025/01/037

New shape for cross-bispectra in Chern-Simons gravity

Perseas Christodoulidis, Jinn Ouk Gong, Wei Chen Lin, Maria Mylova, Misao Sasaki

Department of Science Education

Research output: Contribution to journal › Article › peer-review

Abstract

Chern-Simons gravity is known to suffer from graviton ghost production during inflation, which suppresses the parity-violating power spectrum at scales relevant to cosmic microwave background observations. In this work, we show that allowing the initial conditions of inflation to deviate from the standard Bunch-Davies state can enhance parity-violating non-Gaussianity in the scalar-tensor cross-bispectra. Our results reveal a significant additional contribution to the cross-bispectra in the flattened configuration, offering a new avenue to constrain parity-violating gravity.

Original language	English
Article number	037
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2025
Issue number	1
DOIs	https://doi.org/10.1088/1475-7516/2025/01/037
State	Published - 1 Jan 2025

Bibliographical note

Publisher Copyright:
© 2025 IOP Publishing Ltd and Sissa Medialab. All rights, including for text and data mining, AI training, and similar technologies, are reserved.

Keywords

cosmological perturbation theory
inflation
primordial gravitational waves (theory)
quantum field theory on curved space

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10.1088/1475-7516/2025/01/037

Cite this

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New shape for cross-bispectra in Chern-Simons gravity

Abstract

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Keywords

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