High Energy Theory Group Seminars

A Multiverse Outside of the Swampland

by Gabriele Rigo (IPhT, Saclay)

1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edificio Marzolo)

1/1-2 - Aula "C. Voci"

Dipartimento di Fisica e Astronomia - Edificio Marzolo


A Multiverse can arise from landscapes without de Sitter minima. It can be populated during a period of eternal inflation without trans-Planckian field excursions and without flat potentials. This Multiverse can explain the values of the cosmological constant and of the weak scale. In the process of proving these statements I derive a few simple, but counter-intuitive results. I show that it is easy to write models of eternal inflation compatible with the distance and refined de Sitter conjectures. Secondly, tunneling transitions that move fields from a lower-energy vacuum to a higher-energy vacuum and generate baby Universes are possible, and occur during eternal inflation. Finally, I relax the assumption of no de Sitter minima and show that this more standard Multiverse can be populated by Coleman-De Luccia transitions in about 100 e-folds of inflation.

Organized by

Luca Vecchi