[Seminar] "The future of de Sitter" by Martin Sloth

Abstract: I will discuss how soft graviton modes in de Sitter can be viewed as the Goldstone modes of the spontaneously broken asymptotic symmetry group of de Sitter. I then show that any local measurement, including the effects of the environment, will collapse the symmetric state onto the broken state in the large volume limit. In any discussion involving observers, de Sitter is, therefore, best described globally by the broken phase. In contrast, local observers, in the small volume limit, can not discriminate between different degenerate global vacuum states and are, therefore, best described by the symmetric state. In this picture, the Page time of de Sitter can be viewed as the time scale after which a local volume has inflated to a size where it can no longer be described by the symmetric state.

Zoom info:

Meeting ID: 918 6321 7140

Passcode: 725565