Speaker
Description
This talk explores second-order gravitational waves (GWs) originating from
scalar-tensor perturbation interactions during the radiation-dominated phase
of the Universe. We investigate the unique features and detectability of
these GWs compared to the scalar-induced ones. Unlike scalar-scalar
induced GWs, scalar-tensor induced GWs lack resonances or logarithmic
running in the low frequency spectrum with peaked primordial spectra.
However, they exhibit inheritance of primordial parity violations from tensor
modes, particularly in the ultraviolet (UV) region due to chirality in primordial
GWs. We also address potential divergences in our GWs analysis and
explore solutions. This study significantly contributes to understanding GWs
in the early Universe, with implications for cosmology and GWs detection.
