Explanipedia

SATURNE: The Sarov Tritium Neutrino Experiment for Probing Coherent Elastic Neutrino-Atom Scattering and Neutrino Electromagnetic Interactions Open

M. Cadeddu, F. Dordei, C. Giunti, A. Ivashkin, Konstantin Kouzakov , et al. · 2025

The Sarov tritium neutrino experiment (SATURNE) will study neutrino-atom collisions at unprecedentedly low energies. It will involve a high-intensity tritium source of electron antineutrinos with a total tritium mass of at least 1 kg (10 M…

Shift of UHECR source images by the intergalactic magnetic field Open

Alexander Korochkin, K. Dolgikh, Г. И. Рубцов, D. Semikoz, I. Tkachev · 2025

Self-similar kinetics for gravitational Bose-Einstein condensation Open

A. S. Dmitriev, A. G. Panin, I. Tkachev · 2025

We study an overpopulated gas of gravitationally interacting bosons surrounding a droplet of Bose-Einstein condensate - Bose star. We argue that kinetic evolution of this gas approaches with time a self-similar attractor solution to the ki…

Search for dark-matter axions beyond the quantum limit: The cosmological axion Sarov haloscope proposal Open

A. L. Pankratov, Pavel A. Belov, E. Boos, A.S. Chepurnov, A. V. Chiginev , et al. · 2025

Firmly established in astrophysical observations, dark matter evades direct detection in experiments. Axions and axionlike particles are among the leading dark-matter candidates, and numerous attempts to detect them in laboratories have be…

Cen A hotspot in Ultra-High-Energy Cosmic Rays illuminated by M83 or Cen A? Open

K. Dolgikh, A. Korochkin, Г. И. Рубцов, D. Semikoz, I. Tkachev · 2025

The standard assumption about the influence of the turbulent intergalactic magnetic field (IGMF) on the images of ultra-high-energy cosmic rays (UHECR) sources is that the latter are formed in a random walk mode in the deflection angle. As…

Measuring the evolution of entanglement in Compton scattering Open

I. Tkachev, Sultan Musin, Dzhonrid Abdurashitov, А. В. Баранов, F. Guber , et al. · 2025

The evolution of the entanglement measure during Compton scattering is studied. Our analytical results show that the corresponding measure coincides with the concurrence of the two-qubit state arising after scattering. The state never coll…

Measuring the Evolution of Entanglement in Compton Scattering Open

I. Tkachev, Sultan Musin, Dzhonrid Abdurashitov, А. В. Баранов, F. Guber , et al. · 2024

The evolution of the entanglement measure during Compton scattering is studied. Our analytical results show that the corresponding measure coincides with the concurrence of the two-qubit state arising after scattering. The state never coll…

The Diversity of Gamma Ray Burtsts and Can we learn anything new from GRB 221009 A? Open

B. E. Stern, I. Tkachev · 2024

The brightest gamma-ray burst GRB 231009A has renewed interest in the phenomenon of GRBs,which in many ways still remains a mystery. Reports of “forbidden” multi-TeV photons, causing a lot of theoretical work, do not seem to be confirmed, …

An extremely energetic cosmic ray observed by a surface detector array Open

Rasha Abbasi, M. Allen, R. Arimura, John Belz, D. R. Bergman , et al. · 2023

Cosmic rays are energetic charged particles from extraterrestrial sources, with the highest-energy events thought to come from extragalactic sources. Their arrival is infrequent, so detection requires instruments with large collecting area…

Caustic-like Structures in UHECR Flux after Propagation in Turbulent Intergalactic Magnetic Fields and the caused distortions of the image of a source Open

K. Dolgikh, Alexander Korochkin, Г. И. Рубцов, D. Semikoz, I. Tkachev · 2023

International audience

Testing entanglement of annihilation photons Open

A. Ivashkin, Dzhonrid Abdurashitov, А. В. Баранов, F. Guber, S. Morozov , et al. · 2023

We present a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest. Each annihilation photon has an energy that is five orders of magnitude higher than the energy of photons i…

Self-similar growth of Bose stars Open

A. S. Dmitriev, D. G. Levkov, A. G. Panin, I. Tkachev · 2023

We analytically solve the problem of Bose star growth in the bath of gravitationally interacting particles. We find that after nucleation of this object the bath is described by a self-similar solution of kinetic equation. Together with th…

In memory of Valery Anatol'evich Rubakov Open

В. Н. Гаврин, Дмитрий Сергеевич Горбунов, Григорий Владимирович Домогацкий, Леонид Владимирович Кравчук, Максим Валентинович Либанов , et al. · 2023

Памяти Валерия Анатольевича Рубакова, Гаврин В.Н., Горбунов Д.С., Домогацкий Г.В., Кравчук Л.В., Либанов М.В., Матвеев В.А., Руденко О.В., Сергеев А.М., Старобинский А.А., Ткачев И.И., Троицкий С.В., Щербаков И.А.

Entanglement of annihilation photons Open

A. Ivashkin, Dzhonrid Abdurashitov, А. В. Баранов, F. Guber, S. Morozov , et al. · 2022

We present the results of a new experimental study of the quantum entanglement of photon pairs produced in positron-electron annihilation at rest. The experimental setup includes a system of Compton polarimeters to measure the Compton scat…

Setup of Compton polarimeters for measuring entangled annihilation photons Open

J. N. Abdurashitov, А. Г. Баранов, D. S. Borisenko, F. Guber, A. Ivashkin , et al. · 2022

An experimental setup for studying the Compton scattering of annihilation photons in various (entangled and decoherent) quantum states is presented. Two entangled γ -quanta with an energy of 511 keV and mutually orthogonal polarizations ar…

Propagation Effects in the FRB 20121102A Spectra Open

D. G. Levkov, A. G. Panin, I. Tkachev · 2022

We advance theoretical methods for studying propagation effects in fast radio burst (FRB) spectra. We derive their autocorrelation function in the model with diffractive lensing and strong Kolmogorov-type scintillations and analytically ob…

Instability of rotating Bose stars Open

A. S. Dmitriev, D. G. Levkov, A. G. Panin, E. K. Pushnaya, I. Tkachev · 2021

Light bosonic (axion-like) dark matter may form Bose stars - clumps of\nnonrelativistic Bose-Einstein condensate supported by self-gravity. We study\nrotating Bose stars composed of condensed particles with nonzero angular\nmomentum $l$. W…

Telescope Array anisotropy summary Open

I. Tkachev, Toshihiro Fujii, Dmitry Yu. Ivanov, C. C. H. Jui, K. Kawata , et al. · 2021

In this talk, we summarise the results of recent anisotropy studies conducted by the Telescope Array (TA) collaboration. At largest scales we test the TA data for the presence of a dipole. On smaller scales, an update on the excess of even…

Mass production and characterization of 3-inch PMTs for the JUNO experiment Open

Chuanya Cao, Jilei Xu, Miao He, A. C. Abusleme Hoffman, M. Bongrand , et al. · 2021

Physics potential of the International Axion Observatory (IAXO) Open

E. Armengaud, D. Attié, Stefano Basso, P. Brun, Nikolay Bykovskiy , et al. · 2020

We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO). Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as gaγ ∼ 10−12…

Periodic structure in the FRB 121102 spectra Open

D. G. Levkov, A. G. Panin, I. Tkachev · 2020

Reiterating publically available data, we discover a remarkable periodic structure in the spectra of repeating Fast Radio Burst (FRB) 121102: a set of $(95\pm 16)$ MHz-equidistant peaks with seemingly frequency-independent interpeak distan…

Radio-emission of axion stars Open

D. G. Levkov, A. G. Panin, I. Tkachev · 2020

We study parametric instability of compact axion dark matter structures\ndecaying to radiophotons. Corresponding objects - Bose (axion) stars, their\nclusters, and clouds of diffuse axions - form abundantly in the\npostinflationary Peccei-…

Measurements with a TRISTAN prototype detector system at the “Troitsk nu-mass” experiment in integral and differential mode Open

T. Brunst, T. Houdy, S. Mertens, Alexander Nozik, V. Pantuev , et al. · 2019

Sterile neutrinos emerge in minimal extensions of the Standard Model which\ncan solve a number of open questions in astroparticle physics. For example,\nsterile neutrinos in the keV-mass range are viable dark matter candidates.\nTheir exis…

Full-sky searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array Open

Armando di Matteo, Teresa Bister, Jonathan Biteau, Lorenzo Caccianiga, Olivier Deligny , et al. · 2019

The arrival directions of ultra-high-energy cosmic rays appear to be\napproximately isotropically distributed over the whole sky, but the\nlast-generation UHECR detector arrays, the Pierre Auger Observatory (Auger) and\nthe Telescope Array…

Updated Results on the UHECR Hotspot Observed by the Telescope Array Experiment Open

K. Kawata, Armando di Matteo, Toshihiro Fujii, D. Ikeda, Dmitry Yu. Ivanov , et al. · 2019

The Telescope Array Experiment has observed an indication of intermediate-scale anisotropy in the UHECR arrival directions, called the Hotspot, with $E>57$ EeV around the Ursa Major using the first 5-year data during a period between May 2…

Covering the celestial sphere at ultra-high energies Open

Jonathan Biteau, Teresa Bister, Lorenzo Caccianiga, Olivier Deligny, Armando di Matteo , et al. · 2019

Despite deflections by Galactic and extragalactic magnetic fields, the distribution of ultra-high energy cosmic rays (UHECRs) over the celestial sphere remains a most promising observable for the identification of their sources. Thanks to …

Covering the celestial sphere at ultra-high energies: Full-sky cosmic-ray maps beyond the ankle and the flux suppression Open

J. Biteau, Teresa Bister, Lorenzo Caccianiga, Olivier Deligny, Armando di Matteo , et al. · 2019

Despite deflections by Galactic and extragalactic magnetic fields, the distribution of ultra-high energy cosmic rays (UHECRs) over the celestial sphere remains a most promising observable for the identification of their sources. Thanks to …

TA Anisotropy Summary Open

K. Kawata, Armando di Matteo, Toshihiro Fujii, D. Ivanov, C. C. H. Jui , et al. · 2019

The Telescope Array (TA) is the largest ultra-high-energy cosmic-ray (UHECR) detector in the northern hemisphere. It consists of an array of 507 surface detectors (SD) covering a total 700 km 2 and three fluorescence detector stations over…

Gravitational Bose-Einstein Condensation in the Kinetic Regime Open

D. G. Levkov, A. G. Panin, I. Tkachev · 2018

We study Bose-Einstein condensation and the formation of Bose stars in virialized dark matter halos and miniclusters by universal gravitational interactions. We prove that this phenomenon does occur and it is described by a kinetic equatio…

Bose Condensation by Gravitational Interactions Open

D. G. Levkov, A. G. Panin, I. Tkachev · 2018

We study Bose condensation and formation of Bose stars in the virialized dark matter halos/miniclusters by universal gravitational interactions. We prove that this phenomenon does occur and it is described by kinetic equation. We give expr…

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