Speaker
Description
Extreme mass-ratio inspirals (EMRIs) are expected to provide precision probes of strong field gravity and the nature of compact objects, making them key targets for LISA. While Kerr black holes remain the standard paradigm, exotic compact objects such as
rotating boson stars have emerged as possible alternatives. These horizonless objects can have a toroidal energy distribution, leading to a richer geodesic structure and novel orbital features absent in Kerr spacetimes. In this work, we study the evolution of
equatorial EMRIs around rotating boson stars under the adiabatic approximation. In the quasi-circular limit, we showed that an inspiral can be naturally followed by an outspiral phase, producing a backward chirp in the gravitational-wave signal. We further derive the conditions under which such behaviour can arise in generic compact objects. Finally, we also extend the analysis to eccentric orbits.
| Which topic best fits your talk? | Astrophysics and Cosmology |
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| Affiliations | Universidade de Aveiro |