# Exotic Spin-Dependent Interaction Searches at Indiana University

## TL;DR

This paper discusses two experiments at Indiana University aimed at detecting hypothetical axion-like particles that could mediate spin-dependent interactions, which are important for understanding dark matter and fundamental symmetries.

## Contribution

It introduces two novel experimental approaches designed to search for P-odd and T-odd spin-dependent interactions mediated by axion-like particles.

## Key findings

- Development of two experimental setups at Indiana University
- Potential to improve constraints on axion-like particle interactions
- Advancement in techniques for detecting spin-dependent forces

## Abstract

The axion is a hypothesized particle appearing in various theories beyond the Standard Model. It is a light spin-0 boson initially postulated to solve the strong CP problem and is also a strong candidate for dark matter. If the axion or an axion-like particle exists, it would mediate a P-odd and T-odd spin-dependent interaction. We describe two experiments under development at Indiana University-Bloomington to search for such an interaction.