# de Sitter quantum gravity: advances and challenges

- Institution: CERN
- Department: Theory Colloquia
- Speaker: Gonzalo Torroba
- Year: 2023
- Language: English
- Subjects: Physics
- Source: [CERN](https://videos.cern.ch/record/3009792)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

In this colloquium we will review recent progress in de Sitter quantum gravity, with a focus on two directions: de Sitter solutions in String Theory, and holography. In the first direction, we will discuss energetics arguments that give necessary ingredients for obtaining cosmological solutions. We will then argue that M-theory compactified on a hyperbolic manifold, with Casimir energy and flux, gives a simple and promising candidate for 4-dimensional de Sitter spacetime. In the second part of the talk we will discuss how a novel class of controlled irrelevant deformations in quantum field theory are key for a holographic formulation of de Sitter and an explanation of its entropy. .

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## Lectures

1. [de Sitter quantum gravity: advances and challenges](https://invisiblenetwork.ai/learn/cern/3009792/5eb3d6c75a47), 1 h 15 min (CERN's player)