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
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Mateja Boskovic (DESY, Hamburg)11/3/25, 2:45 PMLightning talk
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...
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Anna Chrysostomou (LPTHE, Sorbonne Université)11/3/25, 2:55 PMLightning talk
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...
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Sk Jahanur Hoque (Université Libre de Bruxelles, Belgium)11/3/25, 3:05 PMLightning talk
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...
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E. Şeyma Kutluk (Scuola Normale Superiore)11/3/25, 3:15 PMLightning talk
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...
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Davide Perrone (University of Geneva)11/3/25, 3:45 PM
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.
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Dr Francesco Serra (Johns Hopkins University)11/3/25, 3:55 PMLightning talk
Testing Lorentz symmetry through black hole physics
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Marta Cocco (Center of Gravity, Niels Bohr Institute and University of Perugia)11/3/25, 4:05 PMPoster
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...
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Hajime Kobayashi (Yukawa Institute for Theoretical Physics, Kyoto University)11/3/25, 4:07 PMPoster
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...
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Sreejith Nair (Indian Institute of Technology Gandhinagar)11/3/25, 4:09 PMLightning talk
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.
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Davide Panella (Niels Bohr Institute & University of Perugia)11/3/25, 4:11 PMPoster
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...
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Shuvayu Roy (Indian Institute of Technology, Gandhinagar)11/3/25, 4:13 PMLightning talk
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...
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Tamar Simhon (BGU)Poster
We have recently proposed a model for a regular black hole, or
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an ultra-compact object, that is premised on having maximally negative radial pressure throughout the entirety of the object’s interior.
This model can be viewed as that of a highly entropic configuration
of fundamental, closed strings near the Hagedorn temperature, but
from the perspective of an observer who is ignorant about... -
Tamanna Jain (LPENS)Lightning talk
In this poster we will present our study on the scattering of boson-star binaries, taking into account
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three effects: point-mass gravitational, tidal, and short-range
scalar-field interactions. We compare analytical results to the
scattering angle extracted from four sequences of numerical-relativity
simulations at fixed energy and varying impact parameter. The
agreement is very good and...