# Synergic Cherenkov-Compton Radiation

## TL;DR

This paper explores the combined Cherenkov and Compton radiation processes emitted by ultra-relativistic electrons in a vacuum altered by intense electromagnetic waves, revealing insights into nonlinear quantum electrodynamics.

## Contribution

It introduces the concept of synergic Cherenkov-Compton radiation in vacuum with a strong electromagnetic wave, proposing experimental methods to observe these phenomena and study vacuum properties.

## Key findings

- Cherenkov radiation occurs in vacuum with a high-intensity electromagnetic wave.
- Electrons emit both Cherenkov and Compton radiation during interaction.
- High-energy photons are not emitted via Cherenkov radiation at extreme energies.

## Abstract

In vacuum with an induced by strong electromagnetic wave refraction index larger than unity, an ultra-relativistic electron emits Cherenkov radiation. During the interaction with this wave the electron also radiates photons via the Compton scattering. Synergic Cherenkov-Compton process can be observed by colliding laser accelerated electrons with a high intensity electromagnetic pulse. Extremely high energy photons cannot be emitted via the Cherenkov radiation because the vacuum refraction index tends to unity at these energies. Experiments on studying these phenomena will reveal the properties of vacuum predicted by nonlinear quantum electrodynamics.