Four-dimensional de Sitter space is a Glauber-Sudarshan state in string theory

TL;DR

This paper demonstrates that four-dimensional de Sitter space can be understood as a Glauber-Sudarshan coherent state within string theory, providing insights into its stability, vacuum energy, and entropy by framing it as a quantum state rather than a vacuum.

Contribution

It introduces a novel perspective by modeling de Sitter space as a coherent state in string theory, addressing longstanding issues related to its stability and swampland criteria.

Findings

De Sitter space is a Glauber-Sudarshan coherent state in string theory.

Quantum corrections and time-varying degrees of freedom are essential for this realization.

Fluctuations are governed by an Agarwal-Tara state, a graviton-added coherent state.

Abstract

We show that four-dimensional de Sitter space is a Glauber-Sudarshan state, i.e. a coherent state, over a supersymmetric solitonic background in full string theory. We argue that such a state is only realized in the presence of temporally varying degrees of freedom and including quantum corrections, with supersymmetry being broken spontaneously. On the other hand, fluctuations over the resulting de Sitter space is governed by the Agarwal-Tara state, which is a graviton (and flux)-added coherent state. Once de Sitter space is realized as a coherent state, and not as a vacuum, its ability to remain out of the swampland as well as issues regarding its (meta)stability, vacuum energy, and finite entropy appear to have clear resolutions.