Ivan Kharuk
A5041402603- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Black Holes and Theoretical Physics
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Noncommutative and Quantum Gravity Theories
- CCD and CMOS Imaging Sensors
- Anomaly Detection Techniques and Applications
- Lightning and Electromagnetic Phenomena
- Relativity and Gravitational Theory
- Solar and Space Plasma Dynamics
- Infrared Target Detection Methodologies
- High-Energy Particle Collisions Research
- International Science and Diplomacy
- Spectral Theory in Mathematical Physics
- Algebraic and Geometric Analysis
- Superconducting and THz Device Technology
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
Institute for Nuclear Research
2016-2024
Chubu University
2024
Joint Institute for Nuclear Research
2023
Moscow Institute of Physics and Technology
2016-2023
University of Utah
2021-2023
Czech Technical University in Prague
2023
Irkutsk State University
2023
Comenius University Bratislava
2023
Moscow Power Engineering Institute
2021
Moscow Aviation Institute
2021
Abstract Recent observations of the Galactic component high-energy neutrino flux, together with detection diffuse gamma-ray emission up to sub-PeV energies, open new possibilities study acceleration and propagation cosmic rays in Milky Way. At same time, both large nonastrophysical backgrounds at TeV energies scarcity events band currently limit these analyses. Here, we use sample cascade estimated above 200 TeV, detected by partially deployed Baikal Gigaton Volume Detector (GVD) 6 yr...
Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come extragalactic sources. Their arrival is infrequent, so detection requires instruments large collecting areas. In this work, we report of an extremely particle recorded by surface detector array Telescope Array experiment. We calculate particle's energy as [Formula: see text] (~40 joules). Its direction points back a void in large-scale structure Universe. Possible...
Baikal-GVD has recently published its first measurement of the diffuse astrophysical neutrino flux, performed using high-energy cascade-like events. We further explore cascade dataset collected in 2018-2022, with aim to identify possible associations between neutrinos and known sources. leverage relatively high angular resolution telescope (2-3 deg.), made by use liquid water as detection medium, enabling study point sources even estimate telescope's sensitivity channel for refine our...
The measurement of the energy spectrum ultra-high-energy cosmic rays (UHECRs) is crucial importance to clarify their origin and acceleration mechanisms. Pierre Auger Observatory in Argentina Telescope Array (TA) US have reported measurements UHECR spectra observed southern northern hemisphere, respectively. region sky accessible both Observatories ($[-15,+24]$ degrees declination) can be used cross-calibrate two spectra. Auger-TA working group was organized 2012 has been understand...
A review of the Baikal-GVD neutrino telescope status after winter 2024 deployment campaign that results in 4 104 opticalmodules installed on 114 vertical strings is presented. The analysis data collected 2018-2023 show presence cosmic flux high-energy cascade channel consistent with observations by IceCube telescope. Track-like events identification first muon candidates.
Abstract The Baikal-GVD neutrino telescope, located in Lake Baikal, Russia, is designed to detect high-energy neutrinos and perform real-time searches for astrophysical sources associated with multimessenger signals, such as gamma-ray bursts, gravitational waves, alerts. Since 2021, the implementation of an automated system has reduced analysis delays 3-10 minutes, enabling efficient classification events into upward-going tracks (muon neutrinos) cascades (all-flavor neutrinos). telescope’s...
The sources of ultra-high-energy cosmic rays are still unknown, but assuming standard physics, they expected to lie within a few hundred megaparsecs from us. Indeed, over cosmological distances lose energy interactions with background photons, at rate depending on their mass number and properties photonuclear photon backgrounds. universe is not homogeneous such scales, hence the distribution arrival directions reflect inhomogeneities in galaxies; shorter loss lengths, stronger anisotropies....
The Telescope Array Collaboration has observed an excess of events with $E \ge 10^{19.4} ~{\rm eV}$ in the data which is centered at (RA, dec) = ($19^\circ$, $35^\circ$). This near center Perseus-Pisces supercluster (PPSC). PPSC about $70 Mpc}$ distant and closest Northern Hemisphere (other than Virgo we are a part). A Li-Ma oversampling analysis $20^\circ$-radius circles indicates arrival direction local significance 4 standard deviations. probability having such close to by chance...
Telescope Array (TA) is the largest ultrahigh energy cosmic-ray (UHECR) observatory in Northern Hemisphere. A surface detector (SD) array covers approximately 700 km$^2$, and SD surrounded by three fluorescence (FD) stations. TA has found evidence for a cluster of cosmic rays with energies greater than 57 EeV from data. In order to confirm this more data, we started TAx4 experiment which expands detection area using new SDs FDs. We construction are arranged square grid 2.08 km spacing at...
We establish a classical analog of the Nambu--Goldstone theorem for spontaneous breaking spacetime symmetries. It provides counting rule independent fields and states which them are gapped. demonstrate that only those symmetry group generators give rise to act nontrivially on vacuum at origin coordinates. Other auxiliary must be excluded from theory by means inverse Higgs constraints. The physical meaning phenomenon an application our results theories massive gravity discussed.
We present updated results of the search for ultra-high energy photons with primary energies greater than 10 EeV. The data Telescope Array Surface Detector collected over 11 years are used in this work. method is based on machine learning classifier, which trained both reconstructed composition-sensitive parameters event and calibrated waveform signals at each triggered station Detector.
The technique for constructing conformally invariant theories within the coset space construction is developed. It reproduces all consequences of conformal invariance and Lagrangians widely-known field theories. method induced representations, which plays key role in construction, allows to reveal a special "Nambu-Goldstone fields" transformations. Namely, their dependence on coordinates turns out be fixed by symmetries. This results appearance constraints possible forms Lagrangians, ensure...
The Telescope Array (TA) is the largest cosmic ray observatory in Northern Hemisphere. It designed to measure properties of rays over a wide range energies. TA with it's low energy extension (TALE) observe cosmic-ray induced extensive air showers between 2 PeV and 100 EeV hybrid mode using multiple instruments, including an array scintillator detectors at Earth's surface telescopes fluorescence Cerenkov light. statistics highest energies being enhanced ongoing construction TAx4 experiment...
We introduce a novel method for identifying the mass composition of ultra-high-energy cosmic rays using deep learning. The key idea is to use chain two neural networks. first network predicts type primary particle individual events, while second infers an ensemble events. apply this Monte-Carlo data Telescope Array Surface Detectors readings, on which it yields unprecedented low error 7% 4-component approximation. also discuss problems applying developed experimental data, and way they can...
The source, propagation and acceleration mechanism of ultra-high-energy cosmic rays (UHECR) have been investigated since the first discovery UHECRs to solve mystery extremely high-energy universe. Telescope Array times 4 (TAx4) experiment, which currently consists 257 Surface Detectors (SDs) 2 Fluorescence Detector (FD) stations, had built in Utah, USA 2019. TAx4 SDs observe secondary particles an extensive air shower induced by UHECR, we reconstruct arrival direction energy UHECR using...
The Telescope Array experiment is an ultra-high energy cosmic ray observatory located in Millard County, Utah, USA. consists of 3 fluorescence detector (FD) stations and 507 surface detectors (SD) that cover area ~$700~ {\rm km}^2$. Hybrid trigger external system for the SD arrays prompts to perform data acquisition when FD detects a shower-like event. In comparison with autonomous trigger, hybrid allows collect air shower has primary below $10^{18.5}~\rm eV$, where efficiency decreases...
We present the first observation by Telescope Array Surface Detector (TASD) of effect thunderstorms on development cosmic ray single count rate intensity over a 700 km$^{2}$ area. Observations variations in secondary low-energy counting rate, using TASD, allow us to study electric field inside thunderstorms, large scale, as it progresses top detector, without dealing with limitation narrow exposure time and space balloons aircraft detectors. In this work, (single rate) were studied found be...
Baikal Gigaton Volume Detector is a cubic kilometer scale water Cherenkov neutrino telescope aimed at registration of astrophysical neutrinos. Detection the double cascade signature events particular interest. A description reconstruction technique presented. The evaluation precision this algorithm shown in contribution.
One of the light signatures in Baikal-GVD neutrino telescope consists hadronic and elec- tromagnetic cascades produced by charged interactions electron tau neutrinos. In case neutral current interactions, all flavors yield cascades. The background cascade channel arises mainly due to discrete stochastic energy losses along atmospheric muon tracks. this contribution, a developed algorithm for event selection is presented.
Optical emissions associated with Terrestrial Gamma-ray Flashes (TGFs) have recently become important subjects in space-based and ground-based observations since these play crucial roles understanding the generation of TGFs during thunderstorms. In this paper, we present first time-resolved leader spectra optical component a downward TGF. The TGF was observed at Telescope Array Surface Detector (TASD) simultaneously other lightning detectors, including Lightning Mapping (LMA), an...
Optical emissions associated with Terrestrial Gamma-ray Flashes (TGFs) have recently become important subjects in space-based and ground-based observations since these play crucial roles understanding the generation of TGFs during thunderstorms. In this paper, we present first time-resolved leader spectra optical component a downward TGF. The TGF was observed at Telescope Array Surface Detector (TASD) simultaneously other lightning detectors, including Lightning Mapping (LMA), an...