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Mr Vladimir Petrov (IHEP)24.11.2026, 09:00
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Elena Arbuzova (Dubna State University and Novosibirsk State University)24.11.2026, 09:10
Abstract.
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The origin of ultra-high-energy cosmic rays (UHECRs) with energies above $10^{20}$ eV is still unknown, since standard stellar mechanisms are insufficient to account for their production. We propose an alternative framework, exploring the possibility that these extremely high-energy particles originate from superheavy dark matter (SHDM). By investigating cosmological evolution... -
GOUTAM MANNA (Prabhat Kumar College, Contai)24.11.2026, 09:55
Abstract
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Modern precision cosmology is now accurate enough that even small departures from the standard picture can be tested, especially when we combine electromagnetic observations with gravitational waves. In this overview talk, we present our recent work on K-essence cosmology, where a non-canonical scalar field can simultaneously shape cosmic expansion and endow spacetime with an... -
Sergey Odintsov (Space Sciences Institute. (ICE-CSIC) and ICREA, Barcelona)24.11.2026, 10:40
Abstract
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Entropic cosmology based on generalised entropy due to S.~Nojiri, S.~D.~Odintsov and V.~Faraoni, %``From nonextensive statistics and black hole entropy to the holographic dark universe,'' Phys. Rev. D \textbf{105} (2022) no.4, 044042 doi:10.1103/PhysRevD.105.044042 is considered. All known non-extreme entropies (Tsallis, Renyi, Barrow, loop cosmology, etc) are particular cases of... -
Alessandro Pesci24.11.2026, 11:25
Abstract
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After the theoretical discovery of Hawking's radiation, the ensuing intriguing connection between gravity and thermodynamics, has been, for more than half a century now, a prominent theme of research, in the quest for an understanding of the intimate nature of spacetime. While recalling some aspects of this endeavour, including the so-called holographic principle which somehow... -
Mr Vladimir Petrov (IHEP)24.11.2026, 12:10
Abstract
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We show how a massive body on the "second" brane could mimic a "dark matter" effect.
Links
Can black holes be produced at high-energy colliders?
V.A. Petrov(Serpukhov, IHEP) (Jul, 2005) Contribution to: HEPFT 2004
• e-Print: gr-qc/0507133 [gr-qc] -
nikolay krasnikov (Institute for Nuclear Research RAS)24.11.2026, 12:35
Abstract
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I shall review both theoretical and experimental aspects of the light dark matter search -
Alexander Zakharov (ITEP, Moscow)24.11.2026, 14:45
Abstract
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General Relativity (GR), developed over 110 years ago, has successfully passed numerous astronomical tests. However, most of these tests have tested GR in the weak gravitational field approximation. Astronomers believe that stellar-mass black holes exist in binary systems, as well as supermassive black holes at the centers of galaxies. These astronomical objects offer the... -
Mikhail Katanaev (Steklov Mathematical Institute)24.11.2026, 15:30
Abstract
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New spherically symmetric smooth global solution of General Relativity with a scalar field is found. It is invariant under global Lorentz rotations. The geodesic equations admit four second rank involutive Killing tensors and are Liouville integrable. The scalar field potential is exponential. If the potential is bounded from below, solutions have cosmological interpretation.... -
Alexander Dolgov (Novosibirsk State University and JINR)24.11.2026, 16:30
Abstract
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A review of observational data from the Hubble and James Webb space telescopes, and ALMA array is presented. It is argued that the discovered contradiction between the observational data and standard ΛCDM cosmology is resolved if the Universe structure formation is seeded by primordial black holes. The proposed scenario is supported by the agreement with observations of the... -
У Цзинсюй24.11.2026, 17:15
Abstract
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Primordial black holes provide a distinctive theoretical laboratory for exploring the interplay between gravitational dynamics, nonequilibrium particle physics, and the thermal history of the early Universe. Across different mass regimes, their evolution is governed by competing processes, including gravitational accretion, cosmological expansion, and quantum evaporation. These... -
mikhail volkov24.11.2026, 18:00
Abstract
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We construct static and axially symmetric magnetically charged hairy black holes in the gravity-coupled Weinberg-Salam theory. Large black holes merge with the Reissner-Nordstr\"om (RN) family, while the small ones are extremal and support a hair in the form of a ring-shaped electroweak condensate carrying superconducting W-currents and up to $22\%$ of the total magnetic charge.... -
Jaime Redondo-Yuste (Princeton University)24.11.2026, 18:45
Abstract
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When two black holes merge, the final black hole settles down by emitting gravitational waves at characteristic tones called quasinormal modes. In general relativity, these tones depend only on the black hole's mass and spin, so measuring several of them tests whether astrophysical black holes are exactly what Einstein's theory predicts. This is black hole spectroscopy. As... -
Yuri Chugreyev (Physics Department, Moscow State University)25.11.2026, 09:00
Abstract
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In A. A. Logunov’s Relativistic Theory of Gravity, it is postulated that the gravitational field—much like all other fields—evolves within Minkowski space, with the energy-momentum tensor of all matter fields (including the gravitational field itself) serving as the source for this field. In this framework, the tensor gravitational field necessarily acquires mass. This paper... -
Andrej Arbuzov (BLTP JINR)25.11.2026, 09:45
Abstract
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Quantum effects in the era of reheating of the universe after inflation are considered. A semiclassical approach to gravity theory is applied within Starobinsky's inflationary model with backreaction. Some subtleties associated with accounting for quantum effects in the one-loop approximation are clarified. An estimate of the contribution of vacuum polarization in the... -
Maxim Khlopov (Virtual Institute of Astroparticle physics)25.11.2026, 10:50
Abstract
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The modern Standard cosmological scenario involves inflation, baryosynthesis and dark matter/energy. Physics of all these elements of the cosmological paradigm lays Beyond the Standard model (BSM) of fundamental interactions (including gravity) and involves in its turn cosmological probes for its study. To specify this physics the idea of multi-messenger probes of new physics is... -
Юрий Зиновьев (ИФВЭ)25.11.2026, 11:35
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Nikita Zaigraev (BLTP JINR, ЬШЗЕ)25.11.2026, 12:20
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Dmitry Gorbunov (INR RAS)25.11.2026, 14:30
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YIFU CAI (University of Science and Technology of China)25.11.2026, 15:15
Abstract
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Astonishingly, it was discovered that distant Type Ia supernovae (SN Ia) were accelerating away at an increasing pace. This led to the great discovery of late-time cosmic acceleration and brought us the concept of dark energy, responsible for such a phenomenon. However, the underlying nature remains mysterious. Theoretically, modified gravity can be a framework to provide an... -
Cristhian Garcia Quintero (Center for Astrophysics Harvard-Smithsonian)25.11.2026, 16:15
Abstract
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Current discrepancies between datasets analyzed in the standard model open the possibility for beyond-LCDM model physics, such as evolving dark energy. However, departures from the standard theory of gravity itself can be potentially misinterpreted as dark energy. Fortunately, the growth of galaxy clustering data provides a way to distinguish between the two. In this talk, we... -
Julio Cesar Fabris (Universidade Federal do Espírito Santo)25.11.2026, 17:00
Abstract
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The standard cosmological model has been successful in describing the ob- served universe. It is a simple model that reproduces different observational data using only a few components of matter and energy. It is based on the Theory of General Relativity. However, this success is achieved by introducing a dark sector composed of dark matter and dark energy, components not yet di-... -
Hermano Velten (Universidade Federal de Ouro Preto)25.11.2026, 17:45
Abstract
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We review nonconservative theories of gravity with particular attention to f(R,T) theories (where T is the trace of the energy-momentum). We provide astrophysical and cosmological consequences of a nonvanishing four-divergence of the energy-momentum tensor.
Links
https://doi.org/10.3390/universe7020038 10.1016/j.dark.2023.101401 -
25.11.2026, 18:30
Discussion leader: Dmitry Gorbunov (INR RAS, Moscow)
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Valery Mitrofanov (M.V. Lomonosov Moscow State University)26.11.2026, 09:00
Abstract
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In September 2015, the detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) detected, for the first time, gravitational waves generated by the merger of two black holes. To date, the detectors of the LVK collaboration—which unites LIGO (USA), the European Virgo, and Japan’s KAGRA—have detected gravitational wave signals from the mergers of black holes and... -
Sergey Vyatchanin (Lomonosov Moscow State Universuty)26.11.2026, 09:45
Abstract
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Laser GW antenna is the unique displacement meter, measuring distance 4 km between 40-kg masses with unique sensitivity about 10^{-19} m. Current sensitivity is close to Standard Quantum Limit (SQL), which is a consequence of Heisenberg uncertainty principle. We discuss the reasons of SQL (measurement noise and back action) and methods to surpass it: quantum non-demolition... -
Azadeh Maleknejad (Swansea University)26.11.2026, 10:30
Abstract
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Gravitational-wave astronomy offers new opportunities for probing fundamental physics. I will briefly review current and future detection techniques and the frequency ranges and observables they can access. I will then discuss two recent proposals that aim to extend the capabilities of gravitational-wave detection in complementary directions. First, I will present QuGrav, a... -
Debashis Gangopadhyay (Sister Nivedita University, Kolkata , India)26.11.2026, 11:30
Abstract
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Gravitational waves (GWs) are independent of any particular theory of gravity. The universality of this notion is highlighted by the Raychaudhuri equation which is independent of any theory of gravity. This equation contains the Ricci tensor R as a key ingredient, thereby connecting spacetime geometry with matter-energy content. Under small metric perturbations, R is... -
Xiatong Li (Московский государственный университет имени М.В.Ломоносова, физический факультет)26.11.2026, 12:15
Abstract
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In this talk, I will present an effective horizon-boundary-sector framework for rotating black holes within dynamical Chern-Simons gravity. We demonstrate that black hole spin activates the parity-violating Pontryagin density, generating a scalar dipole and a frame-dragging correction in the slow-rotation regime. Using the Iyer-Wald formalism, we show that the scalar-Pontryagin... -
Liangyu Luo26.11.2026, 12:24
Abstract
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Extreme-mass-ratio inspirals (EMRIs) provide a unique opportunity to investigate gravitational dynamics in the strong-field regime of rotating black holes and to test general relativity through precision gravitational-wave measurements. Owing to their long-lived orbital evolution, even weak non-vacuum interactions or localized dissipative processes can accumulate into coherent... -
Zhengnan Zhang (Lomonosov Moscow State University)26.11.2026, 12:33
Abstract
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Retention-dependent bounds on electron heating do not by themselves establish whether a nuclear contribution can be identified in polarized radiation. We consider localized energy deposition in irradiated Kerr plasmas, focusing on the interplay between the ({}^{56}\mathrm{Fe}(\gamma,n){}^{55}\mathrm{Fe}) channel and a common Compton background. Previously established... -
Shide Feng (Lomonosov Moscow State University)26.11.2026, 12:42
Abstract
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Jingxu Wu, Shide Feng
This work is about the interactions between Threshold-Excited Dark Matter in the field of Galactic Gravitation and Orbital Dynamics,the focus of his work is the coupling mechanism between orbit motion and internal state evolution. Based on the Two-State Dark Matter Model and QFT, the scattering amplitude and cross section of the ground state and excited... -
Junyi Zhang (Lomonosov Moscow State University)26.11.2026, 12:51
Abstract
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Finite observation windows can obscure mass scaling in extreme mass ratio inspirals. We use FastEMRIWaveforms v2.2.0 to calculate 30 eccentric equatorial inspirals into Kerr black holes with primary masses of (1, 2, 5) × 10⁶ M☉ and secondary masses from 1 to 10 M☉, using common values of the dimensionless spin and initial orbital parameters and a physical duration of 0.01 yr. We... -
Carlo Rovelli (University of Aix-Marseille)26.11.2026, 14:30
Abstract
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Loop Quantum gravity predicts the existence of a semi-stable particle with a mass around 10 micrograms. It can be formed at the end of the evaporation of old black holes. Primordial black hole remnants can be the main components of dark matter. Remnants forming dark matter can be detected.
Links
Carlo Rovelli, Francesca Vidotto, Planck stars, White Holes, Remnants and... -
39. Dynamical Tension Strings with SSB of target space scale invariance, Dark Energy and Dark MatterEduardo Guendelman (Ben-Gurion University of the Negev (BGU))26.11.2026, 15:15
Abstract
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The string tensions can be dynamical in the modified measure formalism and appear as an additional dynamical degrees of freedom . These tensions may not be universal, instead, each string generates its own tension. We then consider a new bulk field that can couple to the strings, the tension scalar which changes locally the tension along the world sheet. In the case with two... -
Djordje Minic26.11.2026, 16:00
Abstract
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Spacetime, as it is currently known in physics, is a classical concept, and our deepest theory of spacetime physics, general relativity, the classical relativistic theory of gravity, is a background independent theory of a dynamical spacetime geometry. Quantum theory, on the other hand, is the deepest theory we have of matter degrees of freedom, and it is currently formulated in... -
Vladimir Lipunov (Lomonosov Moscow State University)26.11.2026, 17:00
Abstract
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One of the most significant milestones in the history of natural science is the 21st-century discovery and localization of gravitational waves. This achievement was not merely the result of a technical revolution—the development of new gravitational-wave detectors with sensitivity two to three orders of magnitude greater than their 20th-century predecessors—but also the... -
Pablo Pais Hirigoyen (Universidad Austral de Chile (UACh))26.11.2026, 17:45
Abstract
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By incorporating two gauge connections, transgression forms provide a generalization of Chern-Simons actions that are genuinely gauge-invariant on bounded manifolds. In this work, we show that, when defined on a manifold with a boundary, the Hamiltonian formulation of a transgression field theory can be consistently carried out without the need to implement regularizing boundary... -
Vladimir Soloviev (IHEP)26.11.2026, 18:30
Abstract
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We study the algebras of Hamiltonian generators in parametrized field theories in Poisson brackets modified to account for boundary contributions. -
Mr Vladimir Petrov (IHEP)26.11.2026, 19:15
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Yuri Chugreyev (Physics Department, Moscow State University)General relativity
В Релятивистской Теории Гравитации А.А.Логунова предполагается, что гравитационное поле, как и все остальные поля, развивается в пространстве Минковского, при этом тензор энергии-импульса всех полей материи, включая и гравитационное поле является источником такого поля. В таком подходе тензорное гравитационное поле с необходимостью становится массивным. В работе в ретроспективном формате...
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