Quantum Exclusion of Positive Cosmological Constant?

TL;DR

This paper argues that a positive cosmological constant cannot be compatible with a quantum-corpuscular description of de Sitter space due to quantum self-destruction of the state, impacting the understanding of the cosmological constant problem.

Contribution

It demonstrates that quantum self-destruction prevents eternal de Sitter space in quantum-corpuscular models, offering a new perspective on the cosmological constant problem.

Findings

Quantum self-destruction of coherent states precludes eternal de Sitter.

The process creates an irreversible quantum clock.

Implications for the quantum consistency of cosmological models.

Abstract

We show that a positive cosmological constant is incompatible with the quantum-corpuscular resolution of de Sitter metric in form of a coherent state. The reason is very general and is due to the quantum self-destruction of the coherent state because of the scattering of constituent graviton quanta. This process creates an irreversible quantum clock, which precludes eternal de Sitter. It also eliminates the possibility of Boltzmann brains and Poincare recurrences. This effect is expected to be part of any microscopic theory that takes into account the quantum corpuscular structure of the cosmological background. This observation puts the cosmological constant problem in a very different light, promoting it, from a naturalness problem, into a question of quantum consistency. We are learning that quantum gravity cannot tolerate exceedingly-classical sources.