A dual description of decoherence in de Sitter space

TL;DR

This paper proposes a dual framework for understanding decoherence in de Sitter space, linking super-Hubble mode decoherence to interactions with an environment near the horizon, supported by consistency checks.

Contribution

It introduces a dual description of decoherence in de Sitter space, connecting super-Hubble modes with horizon-adjacent environmental interactions, and validates it through consistency checks.

Findings

The dual description is consistent with known decoherence phenomena.

Interaction with the horizon environment explains super-Hubble mode decoherence.

The framework passes several theoretical consistency tests.

Abstract

Decoherence associated with super-Hubble modes in de Sitter space may have a dual description, in which it is attributed to interaction of sub-Hubble modes with an ``environment'' residing just inside the observer's horizon. We present a version of such description, together with some consistency checks, which it is shown to pass.