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Zita Csapó (Wigner RCP, ELTE)05/11/2026, 11:00
This work studies the characteristic gluing problem in asymptotically flat spacetimes. In particular, it investigates the conditions under which initial data on different null hypersurfaces can be glued together to form a solution of the Einstein equations. The main focus is on the obstructions to such a gluing construction and their interpretation in terms of conserved quantities. Within the...
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Nefeli Chatz (University of Crete)05/11/2026, 11:15
This project investigates analytical and numerical black hole solutions in Anti-de-Sitter spacetimes. These geometries are of particular interest due to their holographic interpretation in gauge/gravity duality, representing states of a strongly coupled N=4 super Yang-Mills theory with a large number of colors, residing on a three-sphere. First, we derive the equations of motion from a...
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Richárd Tamás Varga (University of Szeged)05/11/2026, 11:30
We investigate the prospects for detecting nanohertz gravitational waves from individual supermassive black hole binaries (SMBHBs) using pulsar timing arrays (PTAs). We review the formation and gravitational radiation of SMBHBs, the principles of pulsar timing, and the current observational capabilities of PTAs, with particular emphasis on the expected sensitivity improvements offered by the...
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Dávid Szepessy (ELTE Fizika Doktori Iskola)05/11/2026, 11:45
Black holes can connect different regions of spacetime: in the Kerr solution, geodesics may pass through or around the ring singularity without destruction. Although perturbations are thought to destabilize such passages by generating additional singularities, their possible existence has direct observational consequences. We show that if Sgr A or M87 is described by the maximally extended...
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Ashika Achuthankutty (University of Szeged and HUN-REN Wigner RCP)05/11/2026, 12:00
In this work, we model slowly rotating neutron stars in massive scalar-tensor gravity, focusing on the massive Damour-Esposito-Farese model. Scalar-tensor theories of gravity with a dynamical scalar field coupling non-minimally to matter via a conformal factor $A(\phi)$ pose computational challenges beyond standard general relativistic solvers. In this theory, matter is coupled to an...
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Domonkos Szabó (Konkoly Observatory)05/11/2026, 12:15
Tidal Disruption Events (TDEs) occur when a star gets too close to a black hole, and its gravitational pull tears the star apart. These events result in a bright burst of electromagnetic radiation and provide important information about the black hole’s environment. When the star is disrupted, approximately half of its material forms an accretion disk around the black hole. The event is mostly...
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Réka Somogyfoki06/11/2026, 14:45
Thermodynamic volume and extensivity in black hole thermodynamics
Black holes lack a coordinate-independent notion of volume, so their thermodynamics is non-extensive. In extended AdS thermodynamics, the mass is treated as enthalpy and the cosmological constant as pressure, but for Schwarzschild-AdS black holes, the resulting volume is fixed by the entropy, leaving the state space...
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Kata Karácsonyi (University of Szeged & HUN-REN Wigner RCP)06/11/2026, 15:00
Higher harmonics from asymmetric compact binaries may enter the Einstein Telescope’s observing band before the dominant quadrupole signal. This ext the interval over which Earth’s rotation changes the detector response. We examine how much noise-weighted signal accumulates during this earlier interval, comparing a triangular detector in the Euregio Meuse–Rhine region with two pairs of...
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Zétény Lőkös-Birdal (Konkoly Observatory / ELTE)06/11/2026, 15:15
In the standard $\Lambda$CDM model of cosmology, the equation-of-state for dark energy is $w = p_{DE}/\rho_{DE} = -1$, which implies a constant energy density throughout the evolution of the Universe. However, recent observations of cosmic expansion and gravitational lensing increasingly favour a dynamic, time-varying dark energy. In the literature, the Chevallier–Polarski–Linder (CPL)...
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