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PHYSICS (573 journals)

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Journal Cover Russian Journal of Mathematical Physics
  [SJR: 0.858]   [H-I: 24]   [0 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1531-8621 - ISSN (Online) 1061-9208
   Published by Springer-Verlag Homepage  [2355 journals]
  • Further extended Caputo fractional derivative operator and its
    • Authors: P. Agarwal; S. Jain; T. Mansour
      Pages: 415 - 425
      Abstract: Abstract In this paper, our principle aim is to establish a new extension of the Caputo fractional derivative operator involving the generalized hypergeometric type function F p (a, b; c; z; k), introduced by Lee et al. Some extensions of the generalized hypergeometric functions and their integral representations are also presented. Furthermore, linear and bilinear generating relations for the extended hypergeometric functions are obtained. We also present some properties of the extended fractional derivative operator.
      PubDate: 2017-10-01
      DOI: 10.1134/s106192081704001x
      Issue No: Vol. 24, No. 4 (2017)
  • Nonrelativistic limit for 2 p × 2 p –Dirac operators with point
           interactions on a discrete set
    • Authors: V. Budyika; M. Malamud; A. Posilicano
      Pages: 426 - 435
      Abstract: Abstract We consider two families of realizations of the 2p×2p–Dirac differential expression with point interactions on a discrete set X = {x n } n=1 ∞ ⊂ ℝ on a half–line (line) and generalize certain results from [10] to the matrix case. We show that these realizations are always self-adjoint. We investigate the nonrelativistic limit as the velocity of light tends to infinity.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040021
      Issue No: Vol. 24, No. 4 (2017)
  • On the optimal form of nano-rods
    • Authors: Yu. V. Egorov
      Pages: 436 - 453
      Abstract: Abstract The Euler–Bernoulli model of elastic nano-rods is considered in the framework of nonlocal elasticity. Existence and uniqueness theorems are proved, the structure of the optimal form under an axial charge is studied. A method of numerical solution is indicated.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040033
      Issue No: Vol. 24, No. 4 (2017)
  • Bi-states and 2-level systems in rectangular Penning traps
    • Authors: M. Karasev; E. Novikova; E. Vybornyi
      Pages: 454 - 464
      Abstract: Abstract We introduce a notion of semiclassical bi-states. They arise from pairs of eigenstates corresponding to tunnel-split eigenlevels and generate 2-level subsystems in a given quantum system. As an example, we consider the planar Penning trap with rectangular electrodes assuming the 3: (−1) resonance regime of the charge dynamics. We demonstrate that, under a small deviation of the rectangular shape of electrodes from the square shape (symmetry breaking), there appear instanton pseudoparticles, semiclassical bi-states, and 2-level subsystems in such a quantum trap.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040045
      Issue No: Vol. 24, No. 4 (2017)
  • A new approach to Catalan numbers using differential equations
    • Authors: D. S. Kim; T. Kim
      Pages: 465 - 475
      Abstract: Abstract In this paper, we introduce two differential equations arising from the generating function of the Catalan numbers which are ‘inverses’ to each other in a certain sense. From these differential equations, we obtain some new and explicit identities for Catalan and higher-order Catalan numbers. In addition, by other means than differential equations, we also derive some interesting identities involving Catalan numbers which are of arithmetic and combinatorial nature.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040057
      Issue No: Vol. 24, No. 4 (2017)
  • Asymptotic expansions for some integrals of quotients with degenerated
    • Authors: S. Kuksin
      Pages: 476 - 487
      Abstract: Abstract We study the asymptotic expansion as ν → 0 for integrals over R2d = {(x, y)} of the quotients F(x, y)/((x · y)2 + (νΓ(x, y))2), where Γ is strictly positive and F decays at infinity sufficiently fast. Integrals of this kind appear in the description of the four-waves interactions.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040069
      Issue No: Vol. 24, No. 4 (2017)
  • On the kernel of the Laplace operator on two-dimensional polyhedra
    • Authors: E. N. Lukzen; A. I. Shafarevich
      Pages: 488 - 493
      Abstract: Abstract The structure of spaces of harmonic functions on polyhedra is studied.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040070
      Issue No: Vol. 24, No. 4 (2017)
  • A model of classical thermodynamics and mesoscopic physics based on the
           notion of hidden parameter, Earth gravitation, and quasiclassical
           asymptotics. II
    • Authors: V. P. Maslov
      Pages: 494 - 504
      Abstract: Abstract This paper presents a new approach to thermodynamics based on two “first principles”: the theory of partitions of integers and Earth gravitation. The self-correlated equation obtained by the author from Gentile statistics is used to describe the effect of accumulation of energy at the moment of passage from the boson branch of the partition to its fermion branch. The branch point in the passage from bosons to fermions is interpreted as an analog of a jump of the spin. A hidden parameter–the measurement time as time of the G¨odel numbering–is introduced.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040082
      Issue No: Vol. 24, No. 4 (2017)
  • Transport through a network of capillaries from ultrametric diffusion
           equation with quadratic nonlinearity
    • Authors: K. Oleschko; A. Khrennikov
      Pages: 505 - 516
      Abstract: Abstract This paper is about a novel mathematical framework to model transport (of, e.g., fluid or gas) through networks of capillaries. This framework takes into account the tree structure of the networks of capillaries. (Roughly speaking, we use the tree-like system of coordinates.) As is well known, tree-geometry can be topologically described as the geometry of an ultrametric space, i.e., a metric space in which the metric satisfies the strong triangle inequality: in each triangle, the third side is less than or equal to the maximum of two other sides. Thus transport (e.g., of oil or emulsion of oil and water in porous media, or blood and air in biological organisms) through networks of capillaries can be mathematically modelled as ultrametric diffusion. Such modelling was performed in a series of recently published papers of the authors. However, the process of transport through capillaries can be only approximately described by the linear diffusion, because the concentration of, e.g., oil droplets, in a capillary can essentially modify the dynamics. Therefore nonlinear dynamical equations provide a more adequate model of transport in a network of capillaries. We consider a nonlinear ultrametric diffusion equation with quadratic nonlinearity - to model transport in such a network. Here, as in the linear case, we apply the theory of ultrametric wavelets. The paper also contains a simple introduction to theory of ultrametric spaces and analysis on them.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040094
      Issue No: Vol. 24, No. 4 (2017)
  • Explicit determination of certain periodic motions of a generalized
           two-field gyrostat
    • Authors: A. A. Oshemkov; P. E. Ryabov; S. V. Sokolov
      Pages: 517 - 525
      Abstract: Abstract The case of motion of a generalized two-field gyrostat found by V. V. Sokolov and A.V. Tsiganov is known as a Liouville integrable Hamiltonian system with three degrees of freedom. For this system, we find some special periodic motions at which the momentum mapping has rank 1. For such motions, all phase variables can be expressed in terms of algebraic functions of a single auxiliary variable and a set of constants. This auxiliary variable satisfies a differential equation which can be integrated in elliptic functions of time. As an application, the explicit formulas of characteristic exponents for determining the Williamson type of the special periodic motions are obtained.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040100
      Issue No: Vol. 24, No. 4 (2017)
  • Estimation of accuracy of an asymptotic solution of the generalized Cauchy
           problem for the Boussinesq equation as applied to the potential model of
           tsunami with a “simple” source
    • Authors: S. Ya. Sekerzh-Zen’kovich
      Pages: 526 - 533
      Abstract: Abstract Statement of the hydrodynamic problem in the framework of the potential tsunami model with “simple” source whose solution is chosen as the reference one. Generalized Cauchy problem for the Boussinesq equation and its reduction to the classical one. Analytical solution of the Cauchy problem for the Boussinesq equation. An explanation of the incorrectness of the formulation of the problem. Derivation of an approximate equation for the correct setting of the Cauchy problem. The known reference solution of the problem. An analytical solution of the correct problem and the derivation of its asymptotic representation in the “far zone.” Comparison of the graphs of the temporal history of wave height calculated by the formulas of the asymptotic and reference solutions. Estimation of the accuracy of the asymptotic solution by a three-level scale. Discussion. A remark concerning the referees.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040112
      Issue No: Vol. 24, No. 4 (2017)
  • A family of pseudo-differential operators on the Schwartz space associated
           with the fractional Fourier transform
    • Authors: H. M. Srivastava; S. K. Upadhyay; K. Khatterwani
      Pages: 534 - 543
      Abstract: Abstract Motivated essentially by their potential for applications in the mathematical, physical, and engineering sciences, the authors introduce and investigate various useful properties of a family of pseudo-differential operators on the Schwartz space S(ℝ) (i.e., the space of rapidly decreasing infinitely differentiable functions on ℝ), which are associated with the fractional Fourier transform of order α (0 < α ≦ 1). Relevant connections with several related recent developments on this subject are also pointed out.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040124
      Issue No: Vol. 24, No. 4 (2017)
  • Asymptotics of linear water waves generated by a localized source near the
           focal points on the leading edge
    • Authors: S. Yu. Dobrokhotov; V. E. Nazaikinskii; A. A. Tolchennikov
      Pages: 544 - 552
      Abstract: Abstract Consider a liquid in a uniform gravitational field in a horizontally infinite basin of variable finite depth. Assume that the liquid performs a potential motion and its state at the initial time is characterized by a given free surface elevation decaying at infinity and by the zero vertical velocities of the free surface (which, for example, corresponds to the so-called piston model of tsunami generation [1, 2]). The problem is to determine the free surface elevation at the subsequent times.
      PubDate: 2017-10-01
      DOI: 10.1134/s1061920817040136
      Issue No: Vol. 24, No. 4 (2017)
  • On some properties of multidimensional hyperbolic quasi-gasdynamic systems
           of equations
    • Authors: B. N. Chetverushkin; A. A. Zlotnik
      Pages: 299 - 309
      Abstract: Abstract We study a multidimensional hyperbolic quasi-gasdynamic (HQGD) system of equations containing terms with a regularizing parameter τ > 0 and 2nd order space and time derivatives; the body force is taken into account. We transform it to a form close to the compressible Navier–Stokes system of equations. Then we derive the entropy balance equation and show that the entropy production is similar to the latter system plus a term of the order of O(τ2). We analyze an equation for the total entropy as well. We also show that the corresponding residuals in the HQGD equations with respect to the compressible Navier–Stokes ones are of the order of O(τ2) too. Finally we treat the simplified barotropic HQGD system of equations with the general state equation and the stationary potential body force and obtain the corresponding results for it.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030037
      Issue No: Vol. 24, No. 3 (2017)
  • Exact and asymptotic solutions of the Cauchy–Poisson problem with
           localized initial conditions and a constant function of the bottom
    • Authors: S. Yu. Dobrokhotov; S. Ya. Sekerzh-Zen’kovich; A. A. Tolchennikov
      Pages: 310 - 321
      Abstract: Abstract In the paper, the asymptotic solutions for a problem of Cauchy–Poisson type with localized initial conditions are constructed. The bottom of the basin under consideration which was constant before the perturbation, is instantly perturbed at the initial time moment by a spatially localized function. Simplifications of the corresponding formulas are presented inside and outside the vicinity of the leading front, as well as in the case of a special choice of the initial condition. It is shown that, in the vicinity of the leading front, the asymptotic solution coincides with the asymptotic solution of the linear Boussinesq equation.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030049
      Issue No: Vol. 24, No. 3 (2017)
  • Asymptotic completeness of scattering in the nonlinear Lamb system for
           nonzero mass
    • Authors: A. I. Komech; A. E. Merzon
      Pages: 336 - 346
      Abstract: Abstract We establish the asymptotic completeness in the nonlinear Lamb system with nonzero mass for hyperbolic stationary states. For the proof, we construct a trajectory of a reduced equation (which is a nonlinear nonautonomous ODE) converging to a hyperbolic stationary point, using the Banach space Inverse Function Theorem and a priori estimates. We give a counterexample showing that the hyperbolicity condition is essential.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030074
      Issue No: Vol. 24, No. 3 (2017)
  • Topological complexity of certain classes of C *-algebras
    • Authors: A. I. Korchagin
      Pages: 347 - 353
      Abstract: Abstract We compute the topological complexity for some important classes of noncommutative C*-algebras: AF algebras, AI algebras, and even Cuntz algebras.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030086
      Issue No: Vol. 24, No. 3 (2017)
  • Representations associated to quasirepresentations of amenable groups with
           zero multiplication of defect operators
    • Authors: A. I. Shtern
      Pages: 373 - 375
      Abstract: Abstract A direct construction of representations associated to dual quasirepresentations with zero multiplication of defect operators for amenable groups is given.
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030104
      Issue No: Vol. 24, No. 3 (2017)
  • Widths of weighted Sobolev classes with constraints f ( a ) = · · · = f
           ( k-1 )( a ) = f ( k )( b ) = · · · = f ( r-1 )( b ) = 0 and the
           spectra of nonlinear differential equations
    • Authors: A. A. Vasil’eva
      Pages: 376 - 398
      Abstract: Abstract In this paper we prove that the Kolmogorov widths of the weighted Sobolev class W p,g r,k [a, b] with restrictions f(a) = · · · = f( k-1)(a) = f( k )(b) = · · · = f( r-1)(b) = 0 in the weighted Lebesgue space L q,v [a, b] coincide with the spectral numbers of some nonlinear differential equation. We assume that 1 < q ≤ p < ∞, the weights are positive almost everywhere, and the Sobolev class is compactly embedded in the space L q,v [a, b].
      PubDate: 2017-07-01
      DOI: 10.1134/s1061920817030116
      Issue No: Vol. 24, No. 3 (2017)
  • Example of nonexistence of a positive generalized entropy solution of a
           Cauchy problem with unbounded positive initial data
    • Authors: L. V. Gargyants
      Pages: 412 - 414
      Abstract: Abstract A Cauchy problem for a first-order quasilinear equation with polynomial flux function and exponential initial data is studied. We prove that this problem has no positive solution in the class of locally bounded functions.
      PubDate: 2017-07-01
      DOI: 10.1134/s106192081703013x
      Issue No: Vol. 24, No. 3 (2017)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
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