The Galactic Center as a laboratory for extreme mass ratio gravitational wave source dynamics

TL;DR

This paper reviews how the Galactic Center serves as a natural laboratory for studying extreme mass ratio inspirals and gravitational wave sources, focusing on stellar dynamics, relaxation processes, and their observational implications.

Contribution

It introduces new insights into mass segregation, loss-cone refilling, and resonant relaxation processes affecting gravitational wave source rates in the Galactic Center.

Findings

Strong mass segregation influences stellar distribution near the black hole.

Observational evidence supports the role of relaxation processes in the Galactic Center.

Implications for Extreme Mass Ratio Inspiral event rates are discussed.

Abstract

The massive Galactic black hole and the stars around it are a unique laboratory for studying how relaxation processes lead to close interactions of stars and compact remnants with the central massive black hole, in particular those leading to the emission of gravitational waves. I review new results on the processes of strong mass segregation and loss-cone refilling by massive perturbers and resonant relaxation; describe observational evidence that these processes play a role in the Galactic Center and can be studied there; and discuss some of the implications for Extreme Mass Ration Inspiral event rates and their properties.