Speaker
Sabino Matarrese
(Dipartimento di Fisica e Astronomia G. Galilei, Università degli Studi di Padova, Italy)
Description
Going beyond linear perturbation theory in cosmology brings several novel phenomena, among which the unavoidable mixing of scalar and tensor perturbation modes. While some of such effects - such as the generation of the so-called Scalar-Induced-Gravitational-Wave background - are nowadays quite popular and largerly analyzed, there are other effects which are less known and deserve attention:
Tensor-Induced-Density-Perturbations, gravitational waves induced by scalar-tensor mixing, effects of scalar modes on the propagation of gravitational waves beyond the geometric optics limit.
I will review these various faces of non-linear perturbation theory in General Relativity, also mentioning some Modified Gravity extensions.
Primary author
Sabino Matarrese
(Dipartimento di Fisica e Astronomia G. Galilei, Università degli Studi di Padova, Italy)
