Observing single-particles beyond the Rindler horizon

TL;DR

This paper demonstrates that single-particle states beyond a Rindler horizon influence the Unruh effect, allowing accelerated observers to detect particles emitted beyond the horizon through a quantum field analysis.

Contribution

It introduces a method to explicitly derive the Wigner characteristic function for quantum fields in non-inertial frames, revealing horizon-related particle effects.

Findings

Single-particle states beyond the horizon alter the Unruh thermal distribution.

Accelerated observers can detect particles emitted beyond the horizon.

The method generalizes to various quantum states in non-inertial frames.

Abstract

We show that Minkowski single-particle states localized beyond the horizon modify the Unruh thermal distribution in an accelerated frame. This means that, contrary to classical predictions, accelerated observers can reveal particles emitted beyond the horizon. The method we adopt is based on deriving the explicit Wigner characteristic function for the complete description of the quantum field in the non-inertial frame and can be generalized to general states.