# TASI Lectures on the Strong CP Problem and Axions

## TL;DR

This paper provides an introductory overview of the Strong CP problem and axions, covering theoretical background, solutions, model building, and experimental searches, aimed at advancing understanding and research in this area.

## Contribution

It offers a comprehensive review of the Strong CP problem and axion solutions, including recent developments and experimental efforts, serving as an educational resource.

## Key findings

- Explanation of the Strong CP problem from classical and quantum perspectives
- Summary of various axion model building approaches
- Overview of proposed experiments to detect axions

## Abstract

These TASI lectures where given in 2018 and provide an introduction to the Strong CP problem and the axion. I start by introducing the Strong CP problem from both a classical and a quantum mechanical perspective, calculating the neutron eDM and discussing the $\theta$ vacua. Next, I review the various solutions and discuss the active areas of axion model building. Finally, I summarize various experiments proposed to look for these solutions.