27–28 Oct 2025
Huygensgebouw
Europe/Amsterdam timezone

Extreme mass ratio inspirals with eccentricity in a scalar cloud environment

28 Oct 2025, 12:00
15m
HG00.307 (Huygensgebouw)

HG00.307

Huygensgebouw

Speaker

Robrecht Keijzer (KU Leuven)

Description

With the upcoming space based gravitational wave detector LISA approaching, many open questions still remain. One of the golden observables for the mission will be Extreme Mass Ratio Inspirals (EMRI); a stellar mass Black Hole (BH) gradually spiralling into its supermassive companion, emitting gravitational waves containing a wealth of information about the BH environment. An exciting possibility is the detection of Dark Matter (DM) signatures from ultralight scalar bosons in these systems , including axions and fuzzy DM. Within my research, I work on extending the framework from Brito and Shah [1] to study the effects of this environment fully relativistically. So far, I have made the first steps to relax the assumption of circular orbits, and study eccentric orbits in this non-vacuum system. Additionally, I am working on a consistent calculation of all the relevant contributions up to lowest order in the expansion, with the goal of making predictions about the evolution of the orbit under reaction with the cloud.

Author

Robrecht Keijzer (KU Leuven)

Presentation materials

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