# Radiowave Detection of Ultra-High Energy Neutrinos and Cosmic Rays

## TL;DR

Radio wave detection is a promising and rapidly advancing method for observing ultra-high energy cosmic rays and neutrinos, leveraging the transparency of the atmosphere and dense media for large-volume measurements.

## Contribution

This paper reviews recent developments in radio detection techniques for cosmic rays and neutrinos, highlighting their potential and current achievements.

## Key findings

- Radio detection of cosmic rays achieves competitive reconstruction quality.
- Radio detection of neutrinos in dense media shows high promise for large-volume observations.
- The method offers a cost-effective and scalable alternative to traditional detection techniques.

## Abstract

Radio waves, perhaps because they are uniquely transparent in our terrestrial atmosphere, as well as the cosmos beyond, or perhaps because they are macroscopic, so the basic instruments of detection (antennas) are easily constructable, arguably occupy a privileged position within the electromagnetic spectrum, and, correspondingly, receive disproportionate attention experimentally. Detection of radio-frequency radiation, at macroscopic wavelengths, has blossomed within the last decade as a competitive method for measurement of cosmic particles, particularly charged cosmic rays and neutrinos. Cosmic-ray detection via radio emission from extensive air showers has been demonstrated to be a reliable technique that has reached a reconstruction quality of the cosmic-ray parameters competitive with more traditional approaches. Radio detection of neutrinos in dense media seems to be the most promising technique to achieve the gigantic detection volumes required to measure neutrinos at energies beyond the PeV-scale flux established by IceCube. In this article, we review radio detection both of cosmic rays in the atmosphere, as well as neutrinos in dense media.