Electromagnetic Antennas for the Resonant Detection of the Stochastic Gravitational Wave Background

TL;DR

This paper explores the potential of electromagnetic resonant cavities to detect high-frequency stochastic gravitational wave backgrounds from the early Universe, focusing on their sensitivity and ability to probe the Universe's most ancient relics.

Contribution

It introduces a method to use electromagnetic antennas for resonant detection of high-frequency gravitational waves near 100 MHz, highlighting their potential for early Universe studies.

Findings

Resonant electromagnetic cavities can be tuned to detect gravitational waves at ~100 MHz.

The study demonstrates how these detectors can probe the energy density of the stochastic background.

It suggests a pathway for experimental efforts to explore the Universe's earliest moments.

Abstract

Stochastic gravitational wave background from the early Universe has a cut-off frequency close to 100 MHz, due to the horizon of the inflationary phase. To detect gravitational waves at such frequencies, resonant electromagnetic cavities are very suitable. In this work, we study the frequency sensitivity of such detectors, and show how we could use them to probe this cut-off frequency and also the energy density per frequency of this stochastic background. This paper paves the way for further experimental studies to probe the most ancient relic of the Universe.