Non Bunch Davies group coherent states, and their quantum signatures in CMB observables

TL;DR

This paper develops a group-theoretical framework to identify generalized coherent states for matter fields in de Sitter space, exploring their implications for inflationary cosmology and CMB observations.

Contribution

It systematically derives all possible coherent states in de Sitter space and relates them to excited initial states used in inflation models.

Findings

Identified all allowed coherent states for matter fields in de Sitter space.

Established connections between these states and commonly used excited initial states.

Discussed potential signatures of these states in CMB observables.

Abstract

We approach the problem of finding generalized states for matter fields in a de Sitter universe, moving from a group theoretical point of view. This has profound consequences for cosmological perturbations during inflation, and for other CMB observables. In a systematic derivation, we find all the allowed generalities that such a state may have, within the requirements of coherent states. Furthermore, we show their relation to the more familiar excited initial states, often used in inflation.