The Hubble Crisis -- a large disagreement between different direct and indirect measurements of the present-day rate of the expansion of the Universe $H_0$ -- remains one of the most significant issues in the $\Lambda CDM$ paradigm despite continuing advances in observational techniques. The talk presents the problems plaguing common $\Lambda CDM$ extentions, with the phantom-crossing dark...
https://disk.yandex.ru/i/pSD17X2_X5Lw7w
The general theory of relativity, presented in 1915, became
a revolution in theoretical physics due to the beauty of its formulation and the universality of its applicability to the physics of gravitational and cosmological phenomena.For more than a hundred years, Einstein's theory of relativity, as
a relativistic theory of gravitation, has been...
We consider an inflationary scenario in the Sushkov cosmology where the rate of inflaton roll defined by the Hubble flow parameter remains constant. We try to solve Friedmann equations exactly for special values of the constant-roll parameter.
The observation of neutrino oscillations provides convincing evidence for non-zero neutrino masses, indicating the existence of a New Physics beyond the Standard Model (SM). A natural generalization on the high-energy scale, theoretically motivated by the idea of Grand Unification, is the left-right symmetry (LR symmetry), in which left- and right- chiral fermions are treated in the same way....
Molecules containing heavy element atoms can be utilized to explore "new" physics beyond the Standard Model through precision experiments designed to detect violations of spatial parity (P) and time reversal (T) symmetries in fundamental interactions. One of the most commonly discussed sources of T and P violation in molecules is the electron electric dipole moment (eEDM) [1]. Although a...
This study investigates the stability of anisotropic collisionless plasma layers to small disturbances within the magnetohydrodynamic (MHD) framework. We focus on the fire hose mode instability, particularly in the context of shear flows in cosmic plasmas. Our analysis is based on moment equations derived from the Vlasov kinetic equation, taking into account heat flow along spatially shearing...
New data obtained with the Event Horizon Telescope (EHT) for black holes in the galaxy M87 (K. Akiyama, et al., Astrophys. J. 875 (1) L5 (2019)) and in the center of our galaxy Srg A (The Event Horizon Telescope Collaboration, The Astrophysical Journal Letters 930 L17 (2022)) require improvements in theoretical predictions, especially regarding the shadow profiles of black holes (BHs). It was...
The low-energy multipole spectrum in isotopes 250-260No is investigated in the framework of fully self-consistent Quasiparticle-Random-Phase Approximation (QRPA) method with Skyrme forces [1,2]. The representative set of Skyrme parametrizations (SLy5, SLy6, SkM* and SVbas) is applied. The main attention is paid to nuclei 252No and 254No, where we have most of the experimental spectroscopic...
In connection with recent NRF experiment for dipole spectra in 156Gd [1], various E1 and M1 excitations in this nucleus are investigated in the framework of the fully self-consistent quasiparticle random phase approximation (QRPA) with Skyrme forces [2]. The low-energy pygmy dipole resonance (PDR), isovector E1 giant dipole resonance (GDR), isovector M1 lowenergy orbital scissors resonance...
In an earlier work [1], the calculation of the molecular parameter Wโ, which characterizes nuclear spin-dependent effects parity violating (NSD-PV) in the ยฒโนSiยนโถOโบ cation for the ground state, was discussed. One of these effects is the nuclear anapole moment [2], which dominates in NSD-PV [3]. The work [1] lists various sources of contributions and their uncertainties, to which the vibrational...
A model for the alpha-decay of actinide nuclei has been presented. Within the framework of this model, the fine structure of alpha-decay and its dependence on the spectroscopic factor are studied.
The calculation of the potential energy of the alpha-cluster system and the wave function of the metastable state is performed taking into account the quadrupole and octupole deformation of the...
ะัะตะดััะฐะฒะปะตะฝ ะผะตัะพะด ัะตัะตะฝะธั ััะฐะฒะฝะตะฝะธั ะจัะตะดะธะฝะณะตัะฐ ะผะตัะพะดะพะผ ะบัะฑะธัะตัะบะธั ัะฟะปะฐะนะฝะพะฒ [1]. ะะฐะดะฐัะฐ ัะฒะพะดะธััั ะบ ะฝะฐั ะพะถะดะตะฝะธั ัะพะฑััะฒะตะฝะฝัั ะทะฝะฐัะตะฝะธะน ะธ ะฒะตะบัะพัะพะฒ ะผะฐััะธัั, ะฟัะธัะตะผ ะฟัะธะผะตะฝะตะฝะธะต ัะฟะปะฐะนะฝ-ะธะฝัะตัะฟะพะปััะธะธ ะฟะพะทะฒะพะปัะตั ะฝะฐั ะพะดะธัั ะบััะพัะฝะพ-ะณะปะฐะดะบะธะต ัะตัะตะฝะธั ะดะฐะถะต ะฟัะธ ะฝะต ะพัะตะฝั ะผะฐะปะพะผ ัะฐะณะต ัะตัะบะธ ะธ ะฝะต ะพัะตะฝั ะฑะพะปััะพะผ ัะฐะทะผะตัะต ะผะฐััะธัั (ัะธั. 1ะฐ). ะะตัะพะด ะฟัะธะผะตะฝะตะฝ ะดะปั ัะตัะตะฝะธั ัะธััะตะผั ะณะธะฟะตััะฐะดะธะฐะปัะฝัั ััะฐะฒะฝะตะฝะธะน ะฟัะธ ัะฐััะตัะฐั ัะฝะตัะณะธะธ ะธ...
The phase dynamics and resonance properties of the Phi-0 Josephson junction are investigated. As the Phi-0 junction is considered a superconductor-ferromagnet-superconductor (S-F-S) Josephson junction, in which the symmetry with respect to time inversion is broken and the current-phase relationship has a phase shift by Phi-0 proportional to the magnetization, perpendicular to the gradient of...
In this paper, the Ising model, a classical model of statistical mechanics, is investigated in order to determine its ground (low-energy) state at fixed random interaction constants J and variable direction of spins in the spin lattice. A new algorithm based on a self-learning bilayer neural network implemented on the Keras library is proposed and investigated to efficiently find the ground...
Aerosol particles in both outdoor and indoor environments are known to be vehicles for the transfer of radioactivity. It is very relevant to solve the problems of the transfer of contaminants both in the free atmosphere and in premises during accidents and abnormal objects using radioactive substances. However, to date, insufficient attention has been paid to solving these problems. In this...
Tricritical behavior in systems with an $n$-component order parameter $\varphi = \{\varphi_a, a = 1, \ldots, n\}$ is described by the action $S(\varphi) = \frac{1}{2}\partial_i\varphi_a\partial_i\varphi_a + \frac{\tau}{2} \varphi_a\varphi_a + \frac{\lambda}{4!} (\varphi_a\varphi_a)^2 + \frac{g}{6!} (\varphi_a\varphi_a)^3$, where the coefficients $\tau$, $\lambda$ and $g$ are parameters of the...
This project investigates the dissipative properties of an accelerated relativistic medium and their connection to the Unruh effect and effective black hole radiation. The thermodynamic properties in spaces with a horizon is one of the most discussed in modern fundamental physics. A notable 2005 string theory limit sets a minimum shear viscosity. We calculated viscosity in an accelerated frame...
In my talk I will review the hydrodynamical approach to the description of the gravitational chiral anomaly in spacetimes with a non-trivial Ricci tensor proportional to the cosmological constant (so-called Einstein manifolds) and discuss an alternative derivation of the Unruh effect in curved spacetime as a non-trivial consequence of the hydrodynamical description of the axial current.
A model is proposed for a classical bosonic string in d=3 Minkowski space with an action functional that includes Gauss and mean world-sheet curvature. The Lagrangian is invariant under 3d Poincarรฉ transformations modulo total divergence. In addition to the diffeomorphism, the action enjoys the extra gauge symmetry with the second derivatives of the scalar gauge parameter. This symmetry gauges...
We present a method to account for the Coulomb interaction in the ultra-rare leptonic decays $B^0_{s,d}\rightarrow \ell^+\ell^-$ and rare semileptonic $B^0_{s,d}\rightarrow h^0\ell^+\ell^-$, where $h^0 = \{K,\pi^0,\eta,\eta'\}$. Taking into account the Coulomb interaction for the decay of $B^0_{s}\rightarrow \mu^+\mu^-$ reduces the discrepancy between theory and experiment more than twice. The...
Heavy neutral gauge boson $Z'$ are predicted by many theoretical schemes of physics beyond the Standard Model, and intensive searches for their signatures will be performed at the next-generation high energy electron-positron colliders. It is quite possible that $Z'$ is heavy enough to lie beyond the discovery reach expected at the LHC, in which case only indirect signatures of Zโฒ exchanges...
Prompt heavy quarkonium production is well described within the collinear parton model in the next-to-leading order of perturbaive QCD at kinematical region of $p_T^{} \gg M$ where $M$ is a mass of a quarkonium state. But the region of small $p_T^{}$ is still being researched and the factorisation approach which is valid here is TMD-factorisation (transverse-momentum dependent). We studied...
The production of Mueller-Navelet dijets is studied within the framework of the
High-Energy Factorization approach [1,2,3]. Such processes are considered to be
sensitive to the effects of BFKL resummation [4]. In Ref.[5], it was shown
that experimental data for dijets with large rapidity gaps can't be described
using NLO DGLAP based Monte-Carlo generators. In the study, we predict...
Masses of the triply heavy tetraquarks of all flavor contents are calculated within the relativistic quark model, based on the quasipotential approach and QCD, and diquark--antidiquark picture of tetraquarks. The relativistic quasipotential equation takes into account all spin-dependent and spin-independent relativistic corrections and the internal structure of the diquarks. The calculated...
We investigate a class of strictly four-dimensional, renormalisible gauge-Yukawa theories with all possible dimension 3 and 4 operators which exhibit Asymptotic Safety - their UV behaviour is controlled by an interacting, ultraviolet fixed point. The conformal window introduced by this fixed point is studied in a systematic expansion, provided by the Veneziano limit. Constraints from the...
The processes of electron-positron annihilation into a virtual photon or a Z-boson is considered. QED radiative corrections due to the initial state radiation in these processes are estimated upto the $\mathcal{O} (\alpha^5)$ order within the leading and next-to-leading logarithmic approximations. The results are relevant for verification of the Standard Model and searches for new physical...
We present a detailed study of the T-even lepton angular distribution in the Drell-Yan process, using a leading-order perturbative QCD calculation within the collinear factorization scheme, including the effects of $\gamma/Z^0$ boson exchange. We analyze the $Q_T$ dependence and compare theoretical predictions with available data from the ATLAS and CMS Collaborations at the LHC.
We study the rare decays corresponding to b โ d transition in the framework of the covariant confined quark model. The transition form factors for the channels B+(0) โ(ฯ+(0), ฯ+(0), ฯ) and B0s โ K(โ)0 are computed in the entire dynamical range of momentum transfer squared. Using the form factors, we compute the branching fractions of the rare decays and our results are found to be matching...
The pion, as an exchange particle, plays a great role in the description of nuclear dynamics, since it has a small mass compared to other mesons. In the report, the Bethe-Salpeter formalism with a separable kernel is applied to describe the quark-antiquark system. The solution of the Bethe-Salpeter integral equation for the pion vertex function is obtained analytically by applying the...
The strange baryon production in Bi+Bi collisions at $\sqrt{s_{NN}}=9.0$ GeV is studied applying the PHSD transport model. Hyperon and anti-hyperon yields, transverse momentum spectra, and rapidity spectra are calculated, their centrality dependence and an impact of the rapidity and transverse momentum cuts are investigated. Hydrodynamic velocity and vorticity fields are calculated and the...
The analysis of two-particle correlations has provided the chief means for determining spatio-temporal characteristics of relativistic heavy ion collisions. We discuss the theoretical formalism behind these studies and the experimental methods used in carrying them out. Recent results from RHIC were put into context in a systematic review of correlation measurements performed over the past two...
We investigate the sensitivity of the light nuclei and hypernuclei production to the strongly interacting nuclei matter equation-of-state (EoS) within the Parton-Hadron-Quantum-Molecular Dynamics (PHQMD) microscopic transport approach.
PHQMD is an n-body microscopic transport approach based on Quantum Molecular Dynamics (QMD) propagation of baryonic degrees of freedom, where clusters are...
Using first-principle numerical simulations of the lattice $SU(3)$ gauge theory, we study the equation of state of the rigidly rotating gluon plasma. We expand the free energy of the rotating system in a series of angular velocity and measure three coefficients of this expansion. The second order correction is associated with the specific moment of inertia of gluon plasma, while the higher...
Using first-principle numerical lattice simulations, we find a new spatially inhomogeneous phase in rigidly rotating gluon plasma. This mixed phase simultaneously possesses both confining and deconfining phases in thermal equilibrium. Unexpectedly, the local critical temperature of the phase transition at the rotation axis does not depend on the angular frequency within a few percent accuracy....
Phase diagram of two color and three color QCD are reviewed. The dualities of QCD phase diagram are discussed in both two and three color cases. It has been shown that the phase diagram of two color QCD is quite helpful and it has a lot of common features with three color one, and predictions recently made in two color QCD was shown to hold qualitatively in real three color QCD. Showing that...
The process of hadronization remains one of the most intriguing problems in high energy hadron physics. As it is not yet possible to construct the theory of hadron production from parton states, different models are used. The most successful (and most fundamental) approach is to use the relativistic string model to describe the QCD field stretched between partons. However, there are enough...
