What if String Theory Has a de Sitter Excited State?

Explore the concept of de Sitter space as an excited state in string theory during this 42-minute conference talk delivered by Keshav Dasgupta at the Erwin Schrödinger International Institute for Mathematics and Physics. Delve into the reasons why four-dimensional de Sitter space exists only as an excited state and not as a vacuum state in string theory. Examine the unique characteristics of this state, known as a Glauber-Sudarshan state, and understand how it differs from a typical coherent state. Gain insights into the implications of this theory for our understanding of the universe and cosmology. For a deeper understanding, consider reviewing section 8.1 of the speaker's recent paper (2404.11680) prior to watching the talk, which was part of the Thematic Programme on "The Landscape vs. the Swampland" held at the ESI in July-August 2024.