Title:

Stochastic gravitational wave anisotropies: a new window into multi-field inflation

Abstract:
Anisotropies of cosmological observables contain valuable information about the primordial fluctuations, famously illustrated by the CMB. One such observable could be a Stochastic Gravitational Wave Background (SGWB) from a first-order phase transition in the early universe, which will necessarily have anisotropies analogous to the CMB. In multi-field inflationary scenarios, SGWB anisotropies can have a significant isocurvature component, which can provide a complementary probe of inflationary physics beyond the standard adiabatic fluctuations of the CMB and LSS. I will explore the potential of such anisotropies as a probe of light fields from the inflationary era and associated heavier fields through the mechanism of Primordial Clocks. I will also show that the strength of GW signal can be significantly enhanced if there is a period of early matter domination.

—-( Video Call )—-
https://lbnl.zoom.us/j/170483588
—===—