3 papers
hep-th2025
Scalar parity-odd trispectrum from gravitational Chern-Simons interaction vertices
Giorgio Orlando, Shingo Akama, Chunshan Lin
In this paper, we explore parity violation in a scalar trispectrum from a dynamical Chern-Simons gravity theory. So far, a graviton-mediated diagram with two vertexes being of gene…
astro-ph.CO2025
Chern-Simons gravitational term coupled to a spectator field
Giorgio Orlando
The Chern-Simons gravitational term is typically coupled to the inflaton field during inflation. In this work, we explore an alternative scenario where the Chern-Simons term is min…
astro-ph.CO2024
Towards testing the general bounce cosmology with the CMB B-mode auto-bispectrum
Shingo Akama, Giorgio Orlando, Paola C. M. Delgado
It has been shown that a three-point correlation function of tensor perturbations from a bounce model in general relativity with a minimally-coupled scalar field is highly suppress…