# Cosmic Ray Models

## TL;DR

This paper reviews recent experimental results and models in high-energy cosmic ray physics, focusing on propagation, anomalies, the knee, and the Galactic to extragalactic transition.

## Contribution

It provides a comprehensive overview of current models and experimental findings, highlighting recent progress and unresolved questions in cosmic ray physics.

## Key findings

- Progress in understanding cosmic ray propagation
- Models explaining the cosmic ray knee
- Insights into the Galactic to extragalactic transition

## Abstract

We review progress in high-energy cosmic ray physics focusing on recent experimental results and models developed for their interpretation. Emphasis is put on the propagation of charged cosmic rays, covering the whole range from $\sim (20-50)$ GV, i.e. the rigidity when solar modulations can be neglected, up to the highest energies observed. We discuss models aiming to explain the anomalies in Galactic cosmic rays, the knee, and the transition from Galactic to extragalactic cosmic rays.