HEP Theory Journal Club

Consistent cosmological models in era of the Swampland

Suddho Brahma

McGill

Recently, it has been conjectured, based on a numerous results from String Theory, that any consistent theory of quantum gravity must obey certain constraints known as the “Swampland conjectures”. These have several consequences for low-energy effective field theories and in their applications to cosmology; most strikingly, the fact that the de Sitter vacuum is ruled out. In this talk, I shall show how the swampland conjectures pose a new challenge for models of early and late time cosmology through examples of a handful consistent models which satisfy these conjectures while also being phenomenologically viable. The interplay between eternal inflation and the swampland shall also be briefly discussed.