# Galactic hum

## TL;DR

This paper explores the possibility that Earth's tremor spectral peaks below 2 mHz are caused by gravitational waves emitted by binary systems near Sgr A*, suggesting a potential new method for detecting such waves.

## Contribution

It proposes a novel hypothesis linking Earth's tremor peaks to gravitational waves from specific binary systems, expanding the scope of gravitational wave detection methods.

## Key findings

- Tremor spectral peaks below 2 mHz coincide with predicted gravitational wave emissions.
- Binary systems with small main sequence stars near Sgr A* could produce detectable gravitational waves.
- Earth's tremor data may serve as an indirect probe for low-frequency gravitational waves.

## Abstract

A number of earth's tremor spectral peaks show a persistent narrow bandwidth incompatible with any geophysical or instrumental origin. These peaks, located at frequencies lower than a few mHz, are in principle consistent with the earth strain waves induced by monochromatic gravitational waves. Exploring this hypothesis under the current cosmological constraints yields that the tremor peaks below 2 mHz are in apparently significant coincidence with the theoretical emission of two binary systems each consisting of a small main sequence star with mass $\sim 10^{-1} M_{\odot}$, captured by Sgr A* in a close orbit.