Gravitational Waves from Sub-lunar Mass Primordial Black Hole Binaries - A New Probe of Extradimensions

TL;DR

This paper proposes that gravitational wave detection of lunar-mass primordial black hole binaries could serve as a new method to test for the existence of extradimensions, especially with high-frequency detectors.

Contribution

It introduces a novel approach to probe extradimensions through gravitational waves from primordial black hole binaries in braneworld models.

Findings

Detection of gravitational waves from lunar-mass PBH binaries is feasible with third-generation detectors.

High-frequency gravitational wave detectors can potentially confirm the existence of extradimensions.

Lunar-mass PBHs could constitute a significant part of dark matter in our galaxy.

Abstract

In many braneworld models, gravity is largely modified at the electro-weak scale ~ 1TeV. In such models, primordial black holes (PBHs) with lunar mass M ~ 10^{-7}M_sun might have been produced when the temperature of the universe was at ~ 1TeV. If a significant fraction of the dark halo of our galaxy consists of these lunar mass PBHs, a huge number of BH binaries will exist in our neighborhood. Third generation detectors such as EURO can detect gravitational waves from these binaries, and can also determine their chirp mass. With a new detector designed to be sensitive at high frequency bands greater than 1 kHz, the existence of extradimensions could be confirmed.