The Sixth Zeldovich meeting

Session

Compact objects and gravitational waves

14 Jul 2026, 15:00

ICRANet, Pescara, Italy

Conveners

Compact objects and gravitational waves

• She-Sheng Xue (ICRANet, Physics Department, Sapienza University of Rome)

5. Black Holes in Microquasars, Little Red Dots and AGN

Felix Mirabel (Instituto de Astronomia y Fisica Espacial. Universidad de Buenos Aires)

14/07/2026, 15:00

Invited talk

The radio emission from Microquasars (MQs), Little Red Dots (LRDs) and Active Galactic Nuclei (AGN) is crucial to gain insight into the mass accretion, relativistic jets and feedback of black holes (BHs) in these astronomical objects. Based on archived radio monitoring data and the VLASS and FIRST sky surveys of the National Radio Observatory (NRAO), were obtain the following achievements: (1)...

73. New insights on cosmic sources from X-ray polarimetry

Giorgio Matt (Roma Tre University)

14/07/2026, 15:35

Invited 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...

35. Neutron and starnge stars in the uniform density approximation.

Gennady Bisnovatyi-Kogan (Space Research Institute Rus. Acad. Sci., Moscow, Russia)

14/07/2026, 16:45

Oral 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.
Homogeneous strange star...

20. Anisotropic hybrid stars: Interplay of superconductivity and magnetic field leading to gravitational waves

Zenia Zuraiq (Indian Institute of Science, Bangalore)

14/07/2026, 17:15

Oral 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...

22. Gravitational waves passing through matter

Prof. Nigel Bishop (Rhodes University)

14/07/2026, 17:30

Oral 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...

55. On expectations of detection of gravitational waves originating from Core-collapse supernovae

Monis Naidoo (Rhodes University; National Institute for Theoretical and Computational Sciences (NITheCS))

14/07/2026, 17:45

Oral presentation

Core-collapse supernovae
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...

18. Accretion of dark matter by compact stars

Baptiste Sirvente

Oral presentation

We present a general relativistic framework to calculate the rate at which a compact star accretes dark matter particles from its environment. We apply the framework to a realistic neutron star in a fermionic dark matter halo. We discuss the effect of accreted dark matter on the interior structure and stability of the neutron star and outline astrophysical consequences, extensions, and...