Conveners
Lightning talks
- Mateja Boskovic
- Anna Chrysostomou
- E. Şeyma Kutluk
- Sk Jahanur Hoque
Lightning talks
- Davide Perrone
- Francesco Serra
Lightning talks: Poster gong show
- Shuvayu Roy
- Davide Panella
- Hajime Kobayashi
- Marta Cocco
- Sreejith Nair
Superradiant instabilities of rotating black holes can give rise to extended bosonic clouds surrounding them - gravitational atoms. These long-lived structures serve as natural laboratories for probing a wide range of parameter space for putative ultralight bosons in nature. The presence of a companion can significantly modify both the cloud's evolution and the orbital dynamics, leaving a...
Semianalytical quasinormal mode (QNM) computations have largely focused on quasinormal frequencies (QNFs), since constructing the eigenfunctions of the underlying QNM boundary-value problem is technically challenging. Yet in black hole merger events, identifying individual QNMs within the observed post-merger superposition of modes is essential for waveform modeling, tests of general...
Gravitational memory effect is the permanent displacement in the relative separation between freely falling particles resulting from the passage of gravitational wave train. We obtain a closed form expression for the linearized perturbation upto quadrupolar order around de Sitter space-times generated by spatially compact sources. We demonstrate that such a source causes a displacement memory...
We write a closed form expression for the metric perturbation around de Sitter that describes gravitational radiation from a compact and slowly varying source, in terms of a consistent multipolar expansion at quadrupolar order. We show that the corresponding displacement memory effect with both the even and odd parities is at a higher order in the radial expansion compared to their flat...
I will discuss a framework which allows to study Dynamical Love Numbers through an Effective Field Theory, using exact solutions for a scalar field in a Schwarzschild background. I will explain how to obtain results up to O(G9) for the first Love Numbers and how to extend the work to include general compact objects.
Testing Lorentz symmetry through black hole physics
Tidal interactions play a fundamental role in shaping binary systems and affect their gravitational-wave (GW) signals, which is crucial for future detectors such as LISA and ET. While tidal effects on binaries are often studied in a weak-field approximation, a fully relativistic description is needed to capture the role of spin and curvature in shaping orbital dynamics and GW emission.
In...
The tidal response of black holes (BHs) encodes key information about gravity in the strong-field regime and directly affects gravitational waveforms from binary inspirals. We study the dynamical tidal response of static, spherically symmetric BHs in the low-frequency regime, where analytic techniques provide valuable insights. Using the Regge–Wheeler equation and the Mano–Suzuki–Takasugi...
Love numbers of compact objects quantify their tidal deformability against external perturbations. It is known that Love numbers of asymptotically flat black holes (BHs) in General Relativity are identically zero. We show that, quite contrary to common expectations, the tidal Love numbers of asymptotically de Sitter black holes in four dimensions are non-zero.
Compact objects can form binary systems in the vicinity of a supermassive black hole (SMBH), resulting in a hierarchical triple system. The presence of the SMBH can leave a detectable imprint on the gravitational waves emitted by the binary, which may be observed by next-generation gravitational wave detectors. One such imprint arises from resonances induced in the binary’s evolution by the...
The vanishing of static Tidal Love numbers for asymptotically flat black holes in four dimensions has been explained using the "Ladder Symmetry", which is a symmetry for the static perturbation equations around such backgrounds. The existence of a Ladder structure among the solutions is known to be a necessary condition for the Love numbers to vanish. Still, it remains an open question whether...
