# Unruh Effect in non local field theories

## TL;DR

This paper investigates the Unruh effect in non local field theories, finding it remains unchanged with Bogoliubov coefficients but shows modifications with Unruh-DeWitt detectors in theories with a minimal length, highlighting methodological differences.

## Contribution

It demonstrates the equivalence breakdown between two methods of analyzing the Unruh effect in non local theories and advocates for the Bogoliubov coefficient approach.

## Key findings

- Unruh effect unchanged in non local theories via Bogoliubov coefficients
- Unruh-DeWitt detector method predicts modifications in theories with minimal length
- Methodological differences explain previous contradictory results

## Abstract

We study Unruh effect for a wide class of non local theories. Using the approach of Bogoliubov coefficents we show that Unruh effect remains entirely unmodified in these theories. However, for those non local theories which incorporate a minimal length, the approach using Unruh-DeWitt detectors predicts a modification in Unruh effect. Previous work shows that this modification may even be drastic. This appears contradictory, with two apparently equivalent methods giving different results. We investigate the origin of the contradiction and show that for these theories, the two methods are indeed inequivalent. We argue that the detector method incorporates an assumption of local interaction that does not hold for non local theories and therefore the method of Bogoliubov coefficients is preferable.