# Particle propagation on spacetime manifolds with static defects

## TL;DR

This paper studies how static defects in spacetime alter scalar and photon fields, affecting their two-point functions, energy-momentum tensors, and dispersion relations, with implications for mass generation and field behavior.

## Contribution

It introduces a detailed analysis of the impact of static spacetime defects on scalar and photon fields, including modifications to their propagators and dispersion relations.

## Key findings

- Defects modify the scalar field two-point function.
- Photon dispersion relations are altered by defects.
- Possible mass generation for scalar fields due to defects.

## Abstract

We investigate the effects of small static defects in the spacetime manifold. The presence of the defects leads to a modification of the scalar field two-point function in Klein-Gordon theory. We calculate the energy-momentum tensor and discuss the possible mass generation for the scalar field in single and multiple defect spacetimes. We also extend these results to the photon field and show that, as a result of the interaction with the defects, the photon dispersion relations are modified.