Microscopic composite systems bound by strong gravity in extra dimensions as candidates for dark matter

TL;DR

This paper explores the formation of small composite systems bound by strong gravity in models with extra dimensions, proposing them as potential dark matter candidates due to their unique properties.

Contribution

It introduces the concept of gravitationally bound composite systems in extra-dimensional models as novel dark matter candidates.

Findings

Bound states can form with particles like quarks, neutrinos, and axions.

These systems have a small cross-section-to-mass ratio.

They are viable candidates for dark matter.

Abstract

In the Arkani-Hamed-Dimopoulos-Dvali (ADD) model with n extra compactified dimensions, the gravitational potential scales as 1/r^{n+1} and becomes significantly stronger at short distances. We investigate the possibility of forming small-sized composite systems of Standard Model particles bound by this potential. Such bound states, composed of quarks, neutrinos, axions, or other particles, exhibit a small cross-section-to-mass ratio, making them viable candidates for dark matter.