The report summarize results of a series of papers on modelling the nuclear-physical evolution of the outer layers (crust) of neutron stars in low mass X-ray binaries. In these systems, material is transferred from the companion star to the neutron star, a process known as 'accretion' in astrophysical literature. As a result, the original crust is replaced by accreted material.
We demonstrate...
A wide range of extreme states of the nuclear matter that cannot be studied in terrestrial conditions is realized in neutron stars, making them a source of information on the properties of baryonic interactions and nuclear matter under conditions different from those in the most stable nuclei. Under such conditions, additional sensitivity to certain properties of baryonic interactions may...
The discovery of lanthanides traces in the kilonova spectra after recording a gamma-ray burst and gravitational waves [1] confirmed theoretical scenarios for the development of the r-process [2], associated with the neutron stars merger at the end of a close binary system evolution. After successful r-process simulation that occurs as a result of the neutron stars merger and observing these...
The possibility of an analytical approximation of nonequilibrium neutrino radiation under core-collapse supernova conditions is considered. Analysis is based on results of a one-dimensional simulation of neutrino propagation, performed self-consistently with hydrodynamics in Prometheus-Vertex code. In minimal model, an analytical approximation depends on four parameters at each point of the...
Despite the overwhelming indirect evidence, the nature of dark matter is still a mystery. This talk will overview the experimental efforts to detect Dark Matter directly, highlighting the latest findings from relevant experiments. Additionally, we will explore emerging technologies aimed at detecting very light Dark Matter candidates. This talk will also discuss the neutrino floor and its...
Studying of transient phenomena reveals some of the most dynamic and explosive objects in the Universe. These transients are crucial for gaining insight into the behavior and evolution of the cosmos. They also help us understand the physics behind non-transient sources, such as how supernovae provide clues about stellar evolution. Regardless of how transients are used to explore different...
Abstract.
Quark-less baryonium diagram appeared in the old paper on baryonium physics (L. Montanet, G.C. Rossi, G.Veneziano, 1980). If two gluon lines in this diagram are cut, we have tetraquark with two quarks and two anti-quarks. This idea can be expanded to multi baryon-antibaryon states of Baryonium Dark Matter (BDM), see (Piskounova, 2023). Baryonium Dark Matter consists of the net of...
The TAIGA experiment current status, recent results and development prospects are presented. The TAIGA observatory addresses ground-based gamma-ray astronomy at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV and astroparticle physics. Presently the pilot TAIGA-1 complex includes integrating air Cherenkov TAIGA-HiSCORE array with 120...
In this study, we analyze Gamma-Ray Burst (GRB) X-ray afterglow light curves from the Swift-XRT GRB catalogue using Autoencoder and Variational Autoencoder models with 1D-convolutional layers. The time series data are compressed into a 3D latent space, from which we reconstruct the original light curves and identify anomalous GRBs based on their reconstruction errors. This approach proves to...
We study interacting classical magnetic and pseudoscalar fields in frames of the axion electrodynamics. A large scale pseudoscalar field can be the coherent superposition of axions or axion like particles. We consider the evolution of these fields inside a spherical clump. Decomposing the magnetic field into the poloidal and toroidal components, we take into account their symmetry properties....
Hypotheses of detection and clustering of events at the LVD detector based on partially ordered time series of readings of scintillation counters are considered [1, 2]. Based on the ensemble technique, a method for separating events has been developed. A comparison of event fullness with respect to the fixed window method is discussed. The results can be useful in statistical analysis of the...
The cosmic ray (CR) spectrum measured at Earth exhibits a knee-like feature around 4 PeV. Recently, a significant number of studies based on the analysis of experimental data from facilities like LHAASO have indicated a potential spatial dependency of this feature.
We present a new diffusion model for the propagation of cosmic rays, which accounts for the spatial dependence of spectral...
In order to study the physical mechanism of solar cosmic ray acceleration, it is necessary to simultaneously study the physical mechanism of a solar flare, since solar cosmic rays are generated during solar flares. Numerous observations, the most important of which is the direct observation of the source of thermal X-ray emission of a flare at the edge of the solar disk, indicate that flares...
The results of the analysis of interplanetary scintillation observation data obtained by the radio telescope Big Scanning Antenna of the Lebedev Physical Institute (BSA LPI) before, during and after the magnetic storm that occurred on December 1-2, 2023 are presented. The observational data are compared with model calculations for corotating and propagating large-scale disturbances. The...
