# A Vector type of Unruh-DeWitt-like detector

## TL;DR

This paper introduces a vector field-based Unruh-DeWitt-like detector that links Larmor and Unruh radiations, providing a more realistic model for particle detection in quantum field theory.

## Contribution

It proposes a new vector field detector model that relates Larmor and Unruh radiations, bridging inertial and accelerated frame phenomena.

## Key findings

- Larmor radiation occurs without an energy gap in the detector.
- Unruh radiation is observed in the accelerated frame.
- The detector model is closer to real-world electromagnetic interactions.

## Abstract

We study a type of an Unruh-DeWitt-like detector based on a vector rather than scalar field. This detector has two energy states and produces Larmor radiation when there is no energy gap between them. This setup indicates that Larmor radiation and Unruh radiation are two counterparts of the same phenomenon. Larmor radiation is observed in the inertial frame, while Unruh radiation is observed in an accelerated frame. The accelerated observer sees that his detector absorbed a particle inside its own accelerated horizon, while the Larmor radiation is the companion particle which leaves the accelerated observer's horizon. Since the detection is based on the electromagnetic field, this type of detector is much closer to the real world than a standard Unruh-DeWitt detector which is coupled to a scalar field.