Daniel Panizo - A cosmological excursion to dark bubbles

The Dark Bubble scenario proposes that an expanding four-dimensional cosmology, equipped with dark energy, can be realised on the boundary of a five-dimensional bubble mediating the decay between two non-supersymmetric anti-de Sitter vacua. In this express journey, I will be your guide to the bulk, where dark bubbles can nucleate and expand. We will depart from string theory at around 11:30 EST, all the way down to four dimensions. The required technology to appreciate the energy scale hierarchy of the model will be provided when crossing the junction conditions border (No need to bring small extra dimensions from home). Stringy corrections will ensure our safe landing on universes with positive cosmological constant. Here we will study the Gauss-Codazzi interplay between the bubble's boundary and bulk, which decorates the expanding cosmology with familiar energy densities, such as gravitational or electromagnetic radiation.