Conveners
Black holes and Penrose process
- Yerlan Aimuratov (Fesenkov Astrophysical Institute)
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Shurui Zhang (ICRANet)16/07/2026, 09:00Invited talk
We report on the increase in irreducible mass resulting from a particle’s plunge along the inner most stable circular orbit (ISCO) into a black hole (BH), examining both cases: the conservative approximation and with gravitational wave (GW) radiation; the former corresponds to BH accretion, and the latter to extreme mass-ratio inspirals (EMRIs). For prograde orbits, we find that the ratio of...
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Arman Tursunov (Silesian University in Opava and Max Planck Institute for Radio Astronomy)16/07/2026, 09:35Invited talk
Rotating black holes provide a unique environment for extracting energy from spacetime rotation through processes occurring inside the ergosphere. In this presentation, I will review the classical Penrose mechanism and its electromagnetic extensions, with particular focus on the electric and magnetic Penrose processes. These mechanisms allow charged particles to gain energy through...
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Wentao Luo (USTC)16/07/2026, 10:10Invited talk
This work presents, for the first time, direct constraints on the black hole─halo mass relation using weak gravitational-lensing measurements. We construct type I and type II active galactic nucleus (AGN) samples from the Sloan Digital Sky Survey, with a mean redshift of 0.4 (0.1) for type I (type II) AGNs. This sample is cross correlated with weak-lensing shear from the Ultraviolet Near...
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Bin Chen (Ningbo University)16/07/2026, 11:00Invited talk
A key challenge in imaging supermassive black holes is disentangling gravitational effects from plasma physics in order to accurately determine spacetime properties, particularly black hole spin. In our recent work, we present a fully covariant and rigorous analysis of the synchrotron emission from accreting plasma in the equatorial plane in the stationary, axisymmetric, high-conductivity...
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Jutta Kunz (University of Oldenburg)16/07/2026, 11:35Invited talk
Black holes, with their strong gravitational fields, provide an important testing ground for theories of gravity beyond General Relativity. Among the many proposed alternatives, considerable recent work has focused on scalar-tensor theories in which a scalar field couples to higher-curvature terms. The black hole solutions that arise in such theories can differ significantly from the...
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Volker Perlick16/07/2026, 12:10Invited talk
Analytical calculations of gravitational lensing by black holes and other compact or ultracompact objects, in particular of the shadow, were originally always done under the assumption that light rays are lightlike geodesics of the spacetime metric, i.e., that effects of a medium can be neglected. More recently the effect of a plasma was taken into account in numerous papers, where the plasma...
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Prof. Vladimir Lipunov (Lomonosov Moscow State University, SAI, Physics Department)16/07/2026, 12:45Invited talk
Observation of this burst, which, based on its brightness, could have been detected by the Galileo telescope diameter, began 200 seconds before the burst itself. That is, before receiving alerts from the gamma-ray observatories. This means that the MASTER network is not only mobile but also has record-breaking combined field-of-view parameters (~4000 square degrees). This sheds new light on...
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