Perseas Christodoulidis, Jinn-Ouk Gong, Wei-Chen Lin, Maria Mylova, Misao Sasaki
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New shape for cross-bispectra in Chern-Simons gravity
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.
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