We study the Lepton Flavor Violating (LFV) e(μ) - τ conversion in Deep Inelastic Scattering (DIS) of electrons (muons) on fixed-target nuclei. Our model-independent analysis is based on the set of low-energy effecti...
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We study the possible impact of dark photons on lepton flavor phenomenology. We derive the constraints on nondiagonal dark photon couplings with leptons by analyzing corresponding contributions to lepton anomalous mag...
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We study the possible impact of dark photons on lepton flavor phenomenology. We derive the constraints on nondiagonal dark photon couplings with leptons by analyzing corresponding contributions to lepton anomalous magnetic moments, rare lepton decays, and the prospects of fixed-target experiments aimed at searching for light dark matter based on missing energy/momentum techniques.
We consider an experiment to search for dark sector particles in dark photon kinetic mixing model by analyze invisible and semi-invisible decays of neutral mesons M0 = π0, η, η′, ω, f2(1270), produced in the NA64...
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In the article we develop an approach to the study of nonlinear problems of mathematical physics, proposed in A. F. Sidorov’s school of thought, and apply it to solving boundary value problems with degeneracy for the...
In the article we develop an approach to the study of nonlinear problems of mathematical physics, proposed in A. F. Sidorov’s school of thought, and apply it to solving boundary value problems with degeneracy for the nonlinear heat (porous medium) equation. The essence of the approach is that the solution of problems is constructed in the form of multiple power series. The convergence of the constructed series is proved by the majorant method. It allows us to propose the existence and uniqueness theorem, which is analogous to the Cauchy-Kovalevskaya theorem for the considered problem. A constructive scheme for finding the coefficients of the series is proposed. A special feature of the study is that the boundary condition is given on a moving closed manifold.
A nonlinear parabolic heat conduction equation with a source is discussed, for which solutions of the heat wave propagating against a cold background at a finite velocity are studied. A new theorem of the existence an...
A nonlinear parabolic heat conduction equation with a source is discussed, for which solutions of the heat wave propagating against a cold background at a finite velocity are studied. A new theorem of the existence and uniqueness of heat waves is proved. A particular case is studied in detail, when the heat wave is invariant and its construction reduces to solving an ordinary differential equation. For the numerical construction of invariant heat waves, an algorithm based on the boundary element method is proposed. Test examples are solved.
The paper develops an algorithm for solving the two-dimensional nonlinear degenerate parabolic heat conduction equation with a source depending on required function, with a specified law of heat wave front motion. The...
The paper develops an algorithm for solving the two-dimensional nonlinear degenerate parabolic heat conduction equation with a source depending on required function, with a specified law of heat wave front motion. The algorithm based on the boundary element method is implemented in the form of a program. To verify it, we use exact solutions the construction of which is reducible to solving a Cauchy problem for ordinary differential equations with a singularity before the highest derivative. The solutions to the Cauchy problem are constructed in the form of power series with recurrently computed coefficients (with a proof of the statement providing its convergence) and by the boundary element method.
The problem of constructing solutions to the nonlinear heat equation with power nonlinearity is considered. The solutions have the form of a traveling wave and simulate the propagation of disturbances over a cold back...
The problem of constructing solutions to the nonlinear heat equation with power nonlinearity is considered. The solutions have the form of a traveling wave and simulate the propagation of disturbances over a cold background with a finite velocity. It is shown that the construction can be reduced to the Cauchy problem for an ordinary second- order differential equation with a singularity multiplying the highest derivative. Its solutions are constructed using the boundary element method based on the dual reciprocity method. A computational experiment is carried out. The results are compared with the solutions of the same problems by the power series method. The calculations have shown the correctness of the developed boundary element algorithm and its advantage compared to the power series segments and the step-by-step method previously proposed by the authors.
A degenerate nonlinear parabolic-type equation with a specified source function is solved. Boundary value problems for various kinds of boundary conditions are considered. Solution algorithms based on the boundary ele...
A degenerate nonlinear parabolic-type equation with a specified source function is solved. Boundary value problems for various kinds of boundary conditions are considered. Solution algorithms based on the boundary element method are constructed. Some examples are discussed. The comparison of the obtained BEM solutions with known exact solutions gives good results.
The technology for creating an information and analytical environment (IAE) for spatial data processing based on the use of spatial data infrastructure (SDI) components and a service-oriented paradigm was proposed for...
The technology for creating an information and analytical environment (IAE) for spatial data processing based on the use of spatial data infrastructure (SDI) components and a service-oriented paradigm was proposed for the management of territorial development. The environment is characterized by its spatial nature and distribution of territorial information resources. At the same time, emphasis is placed on the transition from a standard SDI, as an access medium for the exchange of spatial data, to an SDI of an integration type, as an environment for access, exchange, creation, storage of new sets of spatial and thematic data and processing services. The use of Service-oriented Architecture (SOA), open standards by OGC (Open Geospatial Consortium), Web technologies, standardization of the browser's interface and Web services, allowed to move from local to distributed and 'cloud' computing in which information and computing resources are provided as Web services. The technology for creating an information and analytical environment involves the use of sets (combinations) of thematic Web services with standardized interfaces integrated with standard protocols (SOAP, WSDL, etc.).
In the present work the Mott effect for pions and kaons is described within a Beth- Uhlenbeck approach on the basis of the PNJL model. The contribution of these degrees of freedom to the thermodynamics is encoded in t...
In the present work the Mott effect for pions and kaons is described within a Beth- Uhlenbeck approach on the basis of the PNJL model. The contribution of these degrees of freedom to the thermodynamics is encoded in the temperature dependence of their phase shifts. A comparison with results from Nf = 2 + 1 lattice QCD thermodynamics is performed.
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