Boson mixing and flavor oscillations in curved space-time

TL;DR

This paper develops a quantum field theory framework for boson mixing in curved space-time, deriving new oscillation probabilities and applying them to cosmologically relevant metrics, bridging flat and curved space analyses.

Contribution

It introduces a novel quantum field theory approach for boson mixing in curved space-time and derives general oscillation formulas applicable to cosmological models.

Findings

Derived new oscillation probabilities in curved space-time.

Confirmed the formalism reproduces flat space results.

Applied formulas to Friedmann-Lemaitre-Robertson-Walker metrics.

Abstract

We develop a quantum field theory of boson mixing in curved space. We derive new general oscillation probabilities and prove that the formalism correctly reproduces the flat space limit. We explicitly compute the oscillation formulae for two cosmologically relevant Friedmann-Lemaitre-Robertson-Walker metrics.