This paper deals with correlation functions in a six-dimensional planar fishnet model. Correspondences between spectra of different models are shown, and calculations for correlators in different regimes of the coupling constant are performed.
The experimentally observed significant polarization of Λ and anti-Λ particles in heavy-ion collisions leads to speculations that rapidly rotating swirls of nuclear matter are created. We use the PHSD transport model to simulate the Au+Au collisions at the NICA energies and perform the fluidization procedure determining density, temperature, and velocity, and then calculating vorticity and...
In quantum field theory an important role is played by various hypergeometric functions. Of particular interest is their close relationship with Feynman loop integrals. The latter are used to calculate higher corrections in perturbation theory to the measurable physical processes. Which becomes especially important now that the accuracy of measurements is increasing. There are many ways to...
We probe the five-dimensional Kerr-AdS space time by pulsating strings. First we find particular pulsating string solutions and then semi-classically quantize the theory. For the string with large values of energy, we use the Bohr-Sommerfeld analysis to find the energy of the string as a function of a large quantum number. We also consider the case of constructing a quantum metric tensor.
In order to better understand the dynamics of the quark hadron phase transition in the presence of a magnetic field, the thermal behaviour of the non-perturbative QCD vacuum has been examined. The dynamical configuration of the resulting dual QCD vacuum and its flux tube configuration have been explored in order to investigate the nonperturbative properties of QCD. Within the...
We investigate effects of nonzero Dirac and Majorana CP-violating phases on neutrino-antineutrino oscillations in a magnetic field of astrophysical environments. It is shown that in the presence of strong magnetic fields and dense matter, nonzero CP phases can induce new resonances in the oscillations channels $\nu_e \leftrightarrow \bar{\nu}_e$, $\nu_e \leftrightarrow \bar{\nu}_\mu$ and...
Muon decay spectrum (energy spectrum of an electron in muon decay) can give information about weak interaction and Standard Model in general. Leptonic decays of leptons, such as muon and tau lepton, are a “pure laboratory” for testing the Standard Model and searching for new physics. For such processes, high-precision and highly sensitive experiments can be carried out, in which small...
The study of the scattering process associated with the one-dimensional matrix Schrödinger equation is a classical pursuit within the realm of quantum theory. A comprehensive examination of the overarching characteristics of such scattering processes along a semi-axis, in particular the rigorous verification of unitarity in the context of the S-matrix with closed scattering channels, can be...
The process of double Compton scattering, eγ→eγγ , in a strongly magnetized charge-asymmetric cold electron plasma is considered.The amplitude of the process is obtained for case when the electrons are at an arbitrary Landau level. The expressions for the amplitude of the process in the magnetar case have been obtained. The double Compton scattering in such a plasma is shown to be an efficient...
We consider a four-dimensional quantum field theory with weakly interacting ultraviolet fixed points up to four loop order for gauge couplings, three loop to Yukawa and quartic scalar beta functions. We compute them for a template SU(Nc) gauge theory coupled to Nf fundamental fermions and elementary scalars.
Moreover, we found fixed point couplings, field and mass anomalous dimensions, and...
The WASA@COSY collaboration observed in the total cross section of reaction $pn->dπ^0π^0$ a clear dibaryon resonance in a non-strange sector with a mass of 2380 MeV and a remarkably narrow width of 70 MeV [1]. Later on the ANKE@COSY also found indications to excitation of this dibaryon in other reaction, $pd->pdππ$ [2]. For explanation of the ANKE@COSY data we applied the two-resonance model...
The report is devoted to the theoretical study of the problem of producing heavy neutron-rich nuclei with a closed neutron shell N=126. Data on the lifetime of such new nuclei, as well as mass, decay modes, excited levels, etc., are of great value for testing and developing theoretical models of atomic nuclei. Also, these nuclei form one of the special waiting points in the r-process path, and...
We investigated some characteristics of the behavior of the rotational bands of even nuclei 250−260No and found that for 252No and 254No arises irregularity. Such irrationality is most likely associated not with a change in deformation, but with the evolution of proton and neutron pairing in these nuclei. The study is based on calculations within the Hartree-Fock-Bogolyubov method and the...
Using first-principle numerical simulations of the lattice SU(3) gauge theory, we calculate the isothermal moment of inertia of the rigidly rotating gluon plasma. We find that the moment of inertia unexpectedly takes a negative value below the "supervortical temperature" $T_s = 1.50(10)T_c$, vanishes at $T_s = T_c$, and becomes a positive quantity at higher temperatures. The negative moment of...
Doubly-heavy baryons are similar in dynamics to heavy mesons. To describe the latter, an approximation is used in which the heavy antiquark is considered to be static and the light one determines the dynamics of the meson. In the case of a doubly-heavy baryon, the heavy antiquark is replaced by a static doubly-heavy diquark and the dynamics of the system is again determined only by the light...
Transitional pion form factor; 1/Nc corrections; nonlocal quark model
The fundamental theory of strong interactions is quantum chromodynamics. In the low-energy area, the strong coupling constant is not a small parameter, so the use of methods that do not use perturbation theory, for example, effective quark models, is required.
One of such models is the nonlocal quark model [1]. The model...
The holographic duality relates observables in some $d$-dimensional quantum conformal field theory in a flat spacetime at strong coupling with quantities in a dual classical gravity defined in ($d+1$)-dimensional anti-de Sitter spacetime.
We construct and analyze observables in holographic RG flows for a $3$-dimensional supergravity model with a scalar field and non-trivial potential. In...
Masses of the ground and excited states of asymmetric fully heavy tetraquarks with open charm and/or bottom are calculated within the relativistic quark model, based on the quasipotential approach and QCD, and diquark-antidiquark picture of tetraquarks. The relativistic diquark-antidiquark interaction quasipotential takes into account the internal structure of the diquark and all...
The first images of black holes have opened up new possibilities for testing extended theories of gravity. In this paper, we propose and develop a method for constructing the background of the shadow of spherically symmetrical non-rotating black holes for the case of $g_{11}\neq - g_{00}^{-1}$. The results of the analysis for the extended theories of gravity are compared with the predictions...
The report presents a brief overview of the family of methods for numerical solution of a non-stationary Schrödinger equation, based on an application of the Lee-Trotter-Suzuki product formula to an approximation of the evolution operator. A way for optimizing high-order accuracy circuits is presented. The application of the Lee-Trotter-Suzuki method to solving some non-stationary problems is...
Nowadays, General Relativity is the generally accepted gravitational theory. However, there are some issues, which cannot be explained within the framework of modern physics, such as dark energy, dark matter, inflation etc. One of the ways to solve these problems is to modify gravity. f(R)-gravity is among the simplest ways to modify gravity. Unfortunately, f(R) - theories without screening...
