Conveners
Compact objects and gravitational waves
- She-Sheng Xue (ICRANet, Physics Department, Sapienza University of Rome)
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Giorgio Matt (Roma Tre University)14/07/2026, 15:35Invited talk
The launch of the Imaging X-ray Polarimetry Explorer (IXPE) on December 2021 (re)opened the window of X-ray polarimetry. In its first 4.5 years of operation IXPE observed objects belonging to almost all classes of X-ray sources, with a wealth of interesting and often surprising results. In this talk I will provide a (inevitably biased) review of IXPE results, and briefly discuss possible...
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Prof. Oleg Zaslavskii (Kharkov V. N. Karazin National University)14/07/2026, 16:10Oral presentation
During last decade and a half many results are obtained that show when (i) particle collisions in a strong gravitational eld lead to an unbounded energy in the center of mass Ec:m: of two colliding particles, (ii) when the process leads also to signi cant energy extraction measured at in nity. The set of possible scenarios can be divided to three main cases: (i) collisions near black holes,...
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Gennady Bisnovatyi-Kogan (Space Research Institute Rus. Acad. Sci., Moscow, Russia)14/07/2026, 16:45Oral presentation
Models of neutron and strange stars are studied within the approximation of a uniform density distribution. A universal algebraic equation, valid for any equation of state, is used to estimate the stellar mass at a given density without resorting to the numerical integration of differential equations. Different equations of state for neutron stars had been used.
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Homogeneous strange star... -
Nurzada Beissen (Al-Farabi Kazakh National University, Almaty, Kazakhstan)14/07/2026, 17:00Oral presentation
We use the material medium approach to derive the refractive index that can be associated with the gravitational field of a compact object with a quadrupole moment. We consider both a static deformation and a stationary rotation of the gravitational source as the source of the quadrupole. We show that up to the first order in the quadrupole, the refractive indices of both configurations are...
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Zenia Zuraiq (Indian Institute of Science, Bangalore)14/07/2026, 17:15Oral presentation
Neutron stars, at their cores, are highly dense and, thus, are expected to have a number of exotic processes. This includes a possible phase transition to deconfined quark matter at the core, leading to a hybrid star. The quark matter is expected to additionally be color superconducting. The physics of superconductivity plays an important role in understanding the high density matter in the...
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Prof. Nigel Bishop (Rhodes University)14/07/2026, 17:30Oral presentation
The interaction of gravitational waves (GWs) passing through matter is normally treated as being very weak. We have re-investigated this issue using linearized perturbations within the Bondi-Sachs formalism, with a model comprising a spherical shell of matter surrounding a GW source. We find analytic expressions for the GWs when the background is Minkowskian, but for a general spherically...
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Monis Naidoo (Rhodes University; National Institute for Theoretical and Computational Sciences (NITheCS))14/07/2026, 17:45Oral presentation
Core-collapse supernovae
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Expectations of detections of gravitational waves (GWs) originating from
core-collapse supernovae (CCSNe) have been growing. Whilst detections
with current interferometers limit the frequency range and also limit the
distance to that of galactic origin or its vicinity, estimates of detectable GWs
from CCSNe are of the order of a handful per century. This would... -
Prof. Antonio Enea Romano (UDEA/CERN)Oral presentation