Topological Early Universe Cosmology

I will present a bing-bang free scenario where the early universe is described by a topological phase without propagating degrees of freedom, followed by a standard second phase of Einstein gravity. The set up is a four-manifold of Euclidean…

Gravitational Waves from Early-Universe Turbulence: LISA Prospects and NANOGrav Signal Evidence

We will discuss gravitational wave signals sourced by hydrodynamic and hydromagnetic turbulent sources that might have been present in the early universe at epochs such as the electroweak and quantum chromodynamic (QCD) phase transitions. We consider…

Ecole de Physique