Conveners
Observations across electromagnetic spectrum: from gamma to radio
- Taghi Mirtorabi
Observations across electromagnetic spectrum: from gamma to radio
- Remo Ruffini (ICRANet, ICRA, INAF)
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Rahim Moradi (ICRANet and ICRA-Sapienza)14/07/2026, 09:00Invited talk
Gamma-ray bursts (GRBs) exhibit remarkable diversity in their prompt emission, yet certain spectral features recur across different events. In this presentation we examine the phenomenon of ultrarelativistic prompt emission (UPE); a short, highly luminous keV–MeV interval characterized by a thermal component superimposed on a nonthermal continuum, in a sample of eight GRBs spanning a wide...
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Jorge Armando Rueda Hernandez (ICRANet)14/07/2026, 09:35Invited talk
We will discuss the physics of the ultrarelativistic prompt emission (UPE) phase of GRB 220101A driven by electron positron pairs produced by QED vacuum breakdown.
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Bing Zhang (University of Hong Kong)14/07/2026, 10:10Invited talk
I review the recent progress in studying gamma-ray bursts (GRBs), fast X-ray transients (FXTs), and fast radio bursts (FRBs) within the context of multi-wavelength (MW) and multi-messenger (MM) transient astrophysics. Special attention is paid to the breakthrough observations made with the Einstein Probe, SVOM space telescopes, and the FAST radio telescope. Current understanding and open...
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Prof. DI LI (Department of Astronomy, Tsinghua University)14/07/2026, 11:00Invited talk
Modern physics and astronomy both originated from Galileo. Hertz invented the first antenna and demonstrated the wave-particle duality of light. These developments give rise to radio astronomy and giant dishes. The Parkes multi-beam system transformed single-dish radio astronomy, delivering the largest haul of new pulsars, definitive HI galaxy catalogues, and the standard HI maps of the...
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Marta Burgay (INAF - Osservatorio Astronomico di Cagliari)14/07/2026, 11:35Invited talk
Pulsars are extremely stable natural clocks and, when found in relativistic binary systems, they can be used as exceptional laboratories to test Relativistic gravity in the strong field regime. In this talk I will present the results obtained in this context by studying the now 20-year-long dataset on the double pulsar system J0737-3039A/B, the only binary hosting two active radio pulsars, and...
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Tsvi Piran (The Hebrew University)14/07/2026, 12:10Invited talk
A tidal disruption event (TDE) occurs when an ill-fated star ventures too close to a black hole. The intense gravitational forces of the black hole rip the star apart, sending roughly half of its mass hurtling into space, while the remainder falls back toward the black hole. This process produces a rich, multiwavelength observational signature—typically including an optical and ultraviolet...
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Vadzim Krautsou (University of Turku)14/07/2026, 12:45Invited talk
The Imaging X-ray Polarimetry Explorer (IXPE) has provided the first precise polarization measurements of black hole X-ray binaries, opening a new window on accretion and high-energy emission physics. In my talk, I will review recent IXPE results across different spectral states and discuss models used to interpret the observed polarization signatures. I will focus on what polarization reveals...
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Maura Pilia (INAF - Osservatorio Astronomico di Cagliari)15/07/2026, 15:00Invited talk
In this talk I will review the Northern Cross FRB project, the ongoing effort to equip and use the Northern Cross (NC), the oldest Italian radio telescope, to observe FRBs. I will present the project's main results, highlighting the studies on known FRB repeaters and the population studies within our Galaxy and in a sample of star-forming nearby galaxies. Finally I will describe the future...
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Sergei Grebenev (Space Research Institute, Moscow)15/07/2026, 15:35Invited talk
We present our numerical computations of the broadband radiation spectra forming in a layer of high-temperature ($kT_{\rm e}\sim 50$ keV) semitransparent (with a Thomson optical depth $\tau_{\rm T}\sim 1-3$) plasma with an electron density $N_{\rm e}\sim 10^{17}-10^{19}\ \mbox{cm}^{-3}$ typical for the accretion disk regions surrounding a black hole in X-ray binaries. The computations take...
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Eugene Oks (Auburn University, USA)15/07/2026, 16:10Oral presentation
The explanation of a puzzling observation by Bowman et al 2018 (Nature, 555, 67) of the redshifted 21 cm spectral line from the early Universe, where it was found that the absorption in this line was about 2 to 3 times stronger than predicted by the standard cosmology and thus the primordial hydrogen gas was significantly cooler than predicted by the standard cosmology, required as the cooling...
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Muhammad Usman (Institute of Space Technology (IST), Islamabad)15/07/2026, 16:45Oral presentation
We investigate the quantum dynamics of a spatially homogeneous quintessence field. It is thought that the ground state of the quintessence acts as the cosmological constant in the dynamical dark energy framework. The correlation function and power spectrum of quantum fluctuations exhibit ultraviolet divergence. To address this issue, we reformulate the system by interpreting quintessence as a...
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Manuel Hohmann (University of Tartu)15/07/2026, 17:00Invited talk
One of the most important open questions in cosmology is the so-called Hubble tension, which is an apparent disagreement between local universe measurements of the present-time Hubble parameter and measurements inferred from early-universe observations under the assumption of the $\Lambda$CDM model, which supplements general relativity (GR) with a cosmological constant $\Lambda$ and cold dark...
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Dr Bobir Toshmatov (New Uzbekistan University)15/07/2026, 17:15Oral presentation
We demonstrate how the shadow radius of regular black holes can serve as a powerful diagnostic tool for general relativity coupled with nonlinear electrodynamics (NED). By analyzing Bardeen-like, Hayward-like, and Maxwellian regular spacetimes, we highlight the critical distinction between standard null geodesics and the NED-driven effective photonsphere that governs light propagation. We show...
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Kirill Zhirkov (Lomonosov Moscow State University)15/07/2026, 17:30Oral presentation
In 2013, neutrino observatory IceCube first reported discovery of high-energy (100 TeV and more) neutrinos of astrophysical origin. However, due to a bad spatial localization of these neutrinos (more than 1 arcdegree) origin of these neutrinoes stayed unknown. To find their progenitor, IceCube Collaboration organized multimessenger observations. Since 2016, IceCube Collaboration has published...
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Prof. Andrzej Radosz (Institute of Theoretical Physics, Wroclaw University of Science and Technology, Wroclaw, Poland)15/07/2026, 17:45Oral presentation
In a large class of cosmological models quantization of a scalar free field leads to the picture of a system of harmonic oscillators coupled via terms corresponding to creation/annihilation of pairs of particles, obeying momentum conservation. In such a case, an evolution of a creation/annihilation operators, meant as a Bogolyubov transformation, may be regarded as a “rotation” in a...
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