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Title:
Probing massive gauge boson signals from axion inflation: gravitational waves and parity-odd trispectrum
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Abstract:
Considering a Chern-Simons coupling between gauge bosons and a pseudoscalar inflaton, one of the transverse gauge modes is efficiently produced. Its inverse decay leaves an imprint in the primordial scalar and tensor perturbations. These perturbations give rich predictions in cosmology, including cosmological collider, gravitational waves, and parity-odd trispectrum. I will show that the upcoming gravitational wave interferometers can detect the tensor part. Also, the axion inflation model gives the distinct parity odd trispectrum, which is a potential explanation for the recent observation of parity-odd galaxy trispectrum from the BOSS galaxy data.
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