Leading-order nonlinear gravitational waves from reheating magnetogeneses

by Yutong He (Nordita)

Wednesday 24 Nov 2021, 13:30 → 14:30 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Hybrid talk: Mega (6228, Hus 3, Albano) + https://stockholmuniversity.zoom.us/j/530682073

We study the leading-order nonlinear gravitational waves (GWs) produced by an electromagnetic (EM) stress in nonhelical and helical reheating magnetogenesis scenarios. By numerically solving the linear and leading-order nonlinear GW equations, we find that for both nonhelical and helical scenarios, GW energy is usually enhanced by nonlinearity; whilst for helical scenarios, GW polarization is suppressed. Such nonlinear features are given order-of-magnitude estimates in terms of the sourcing EM energy and then parameterized numerically. Prospects of observation by pulsar timing arrays, space-based interferometers, and other novel detection proposals are also discussed.