Workshop on Gravitational Waves, Cosmology and Fundamental Physics

In this talk, I will introduce recent progress on gravitational waves (GWs) from cosmological first-order phase transitions associated with primordial black hole (PBH) production, the collisions between PBHs and vacuum bubbles, sound waves and GWs from gravitational collapse, induced GWs from curvature perturbations with non-Gaussianity up to all orders.

In this talk, I will report our progresses on the simulation of Gravitational wave and particle productions from cosmic strings.

We propose a two-field model where the inflaton χ is non-minimally coupled to the instanton ϕ. By choosing an appropriate coupling function, we realize the scenario where the difference of the values of potential between false vacuum (FV) and true vacuum (TV) is maximized during inflation. Most of the bubbles are created at this time. After inflation ends, the potential value of FV...