# Behavior of light polarization in photon-scalar interaction

## TL;DR

This paper investigates how light polarization affects photon interactions with massive objects within a quantum gravity framework, revealing polarization-dependent forces that challenge traditional equivalence principles.

## Contribution

It introduces a quantum gravity approach to analyze photon-scalar interactions, showing polarization-dependent effects that differ from classical expectations.

## Key findings

- Photon interactions depend on polarization.
- Potential for both attractive and repulsive forces.
- Challenges the classical equivalence principle.

## Abstract

Quantum theories of gravity help us to improve our insight into the gravitational interactions. Motivated by the interesting effect of gravity on the photon trajectory, we treat a quantum recipe concluding a classical interaction of light and a massive object such as the sun. We use the linear quantum gravity to compute the classical potential of a photon interacting with a massive scalar. The leading terms have a traditional $1/r$ subordinate and demonstrate a polarization-dependent behavior. This result challenges the equivalence principle; attractive and/or repulsive interactions are admissible.