New shape for cross-bispectra in Chern-Simons gravity
High Energy Physics - Theory
2024-09-17 v1 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
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.
Cite
@article{arxiv.2409.09935,
title = {New shape for cross-bispectra in Chern-Simons gravity},
author = {Perseas Christodoulidis and Jinn-Ouk Gong and Wei-Chen Lin and Maria Mylova and Misao Sasaki},
journal= {arXiv preprint arXiv:2409.09935},
year = {2024}
}