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# Volume 15, Number 4-5, 2010 On the 60th birthday of professor V.V. Kozlov

 Valery Vasilievich Kozlov. On His 60th Birthday Abstract Citation: Valery Vasilievich Kozlov. On His 60th Birthday , Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 419-424 DOI:10.1134/S1560354710040015
 Arnold V. I. Are quadratic residues random? Abstract Keywords: arithmetical dynamics, quadratic residue, randomness Citation: Arnold V. I., Are quadratic residues random?, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 425-430 DOI:10.1134/S1560354710040027
 Bogoyavlenskij O. I.,  Reynolds A. P. Criteria for existence of a Hamiltonian structure Abstract The necessary and sufficient conditions are derived for the existence of a Hamiltonian structure for 3-component non-diagonalizable systems of hydrodynamic type. The conditions are formulated in terms of tensor invariants defined by the metric $h_{ij}(u)$ constructed from the Haantjes (1,2)-tensor. Keywords: Poisson brackets, conformally flat metric, covariant derivatives, Weyl–Schouten equations, Haantjes tensor Citation: Bogoyavlenskij O. I.,  Reynolds A. P., Criteria for existence of a Hamiltonian structure, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 431-439 DOI:10.1134/S1560354710040039
 Borisov A. V.,  Mamaev I. S.,  Ramodanov S. M. Coupled motion of a rigid body and point vortices on a two-dimensional spherical surface Abstract The paper is concerned with a class of problems which involves the dynamical interaction of a rigid body with point vortices on the surface of a two-dimensional sphere. The general approach to the 2D hydrodynamics is further developed. The problem of motion of a dynamically symmetric circular body interacting with a single vortex is shown to be integrable. Mass vortices on $S^2$ are introduced and the related issues (such as equations of motion, integrability, partial solutions, etc.) are discussed. This paper is a natural progression of the author’s previous research on interaction of rigid bodies and point vortices in a plane. Keywords: hydrodynamics on a sphere, coupled body-vortex system, mass vortex, equations of motion, integrability Citation: Borisov A. V.,  Mamaev I. S.,  Ramodanov S. M., Coupled motion of a rigid body and point vortices on a two-dimensional spherical surface, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 440-461 DOI:10.1134/S1560354710040040
 Gonchenko S. V.,  Gonchenko V. S.,  Shilnikov L. P. On a homoclinic origin of Hénon-like maps Abstract We review bifurcations of homoclinic tangencies leading to Hénon-like maps of various kinds. Keywords: homoclinic tangency, Hénon-like maps, saddle-focus fixed point, wild-hyperbolic attractor Citation: Gonchenko S. V.,  Gonchenko V. S.,  Shilnikov L. P., On a homoclinic origin of Hénon-like maps, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 462-481 DOI:10.1134/S1560354710040052
 Gutkin E. Geometry, topology and dynamics of geodesic flows on noncompact polygonal surfaces Abstract We establish the background for the study of geodesics on noncompact polygonal surfaces. For illustration, we study the recurrence of geodesics on $\mathbb{Z}$-periodic polygonal surfaces. We prove, in particular, that almost all geodesics on a topologically typical $\mathbb{Z}$-periodic surface with a boundary are recurrent. Keywords: (periodic) polygonal surface, geodesic, skew product, cross-section, displacement function, recurrence, transience, ergodicity Citation: Gutkin E., Geometry, topology and dynamics of geodesic flows on noncompact polygonal surfaces, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 482-503 DOI:10.1134/S1560354710040064
 Khesin B. A.,  Tabachnikov S. Contact complete integrability Abstract Complete integrability in a symplectic setting means the existence of a Lagrangian foliation leaf-wise preserved by the dynamics. In the paper we describe complete integrability in a contact set-up as a more subtle structure: a flag of two foliations, Legendrian and co-Legendrian, and a holonomy-invariant transverse measure of the former in the latter. This turns out to be equivalent to the existence of a canonical $\mathbb{R} \times \mathbb{R}^{n−1}$ structure on the leaves of the co-Legendrian foliation. Further, the above structure implies the existence of n commuting contact fields preserving a special contact 1-form, thus providing the geometric framework and establishing equivalence with previously known definitions of contact integrability. We also show that contact completely integrable systems are solvable in quadratures. We present an example of contact complete integrability: the billiard system inside an ellipsoid in pseudo-Euclidean space, restricted to the space of oriented null geodesics. We describe a surprising acceleration mechanism for closed light-like billiard trajectories. Keywords: complete integrability, contact structure, Legendrian foliation, pseudo-Euclidean geometry, billiard map Citation: Khesin B. A.,  Tabachnikov S., Contact complete integrability, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 504-520 DOI:10.1134/S1560354710040076
 Li D.,  Sinai Y. G. Blowups of complex-valued solutions for some hydrodynamic models Abstract We study complex-valued blowups of solutions for several hydrodynamic models. For complex-valued initial conditions, smooth local solutions can have finite-time singularities since the energy inequality does not hold. By using some version of the renormalization group method, we derive the equations for corresponding fixed points and analyze the spectrum of the linearized operator. We describe the open set of initial conditions for which blowups at finite time can occur. Keywords: blowup, renormalization group method Citation: Li D.,  Sinai Y. G., Blowups of complex-valued solutions for some hydrodynamic models, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 521-531 DOI:10.1134/S1560354710040088
 Mari Beffa  G.,  Olver P. J. Poisson structures for geometric curve flows in semi-simple homogeneous spaces Abstract We apply the equivariant method of moving frames to investigate the existence of Poisson structures for geometric curve flows in semi-simple homogeneous spaces. We derive explicit compatibility conditions that ensure that a geometric flow induces a Hamiltonian evolution of the associated differential invariants. Our results are illustrated by several examples of geometric interest. Keywords: moving frame, Poisson structure, homogeneous space, invariant curve flow, differential invariant, invariant variational bicomplex Citation: Mari Beffa  G.,  Olver P. J., Poisson structures for geometric curve flows in semi-simple homogeneous spaces, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 532-550 DOI:10.1134/S156035471004009X
 Maciejewski A. J.,  Przybylska M. Partial integrability of Hamiltonian systems with homogeneous potential Abstract In this paper we consider systems with n degrees of freedom given by the natural Hamiltonian function of the form $H = \frac{1}{2} {\bf p}^T {\bf Mp} + V({\bf q})$, where ${\bf q} = (q_1, \ldots, q_n) \in \mathbb{C}^n$, ${\bf p}= (p_1, \ldots, p_n) \in \mathbb{C}^n$, are the canonical coordinates and momenta, $\bf M$ is a symmetric non-singular matrix, and $V({\bf q})$ is a homogeneous function of degree $k \in Z^*$. We assume that the system admits $1 \leqslant m < n$ independent and commuting first integrals $F_1, \ldots F_m$. Our main results give easily computable and effective necessary conditions for the existence of one more additional first integral $F_{m+1}$ such that all integrals $F_1, \ldots F_{m+1}$ are independent and pairwise commute. These conditions are derived from an analysis of the differential Galois group of variational equations along a particular solution of the system. We apply our result analysing the partial integrability of a certain $n$ body problem on a line and the planar three body problem. Keywords: integrability, non-integrability criteria, monodromy group, differential Galois group, hypergeometric equation, Hamiltonian equations Citation: Maciejewski A. J.,  Przybylska M., Partial integrability of Hamiltonian systems with homogeneous potential, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 551-563 DOI:10.1134/S1560354710040106
 Neishtadt A. I.,  Artemyev A. V.,  Zelenyi L. M. Regular and chaotic charged particle dynamics in low frequency waves and role of separatrix crossings Abstract We consider interaction of charged particles with an electromagnetic (electrostatic) low frequency wave propagating perpendicular to a uniform background magnetic field. The effects of particle trapping by the wave and further acceleration of a surfatron type are discussed in details. Method for this analysis based on the adiabatic theory of separatrix crossing is used. It is shown that particle can unlimitedly accelerate in the trapping in electromagnetic waves and energy of particle does not increase for the system with electrostatic wave. Keywords: surfatron acceleration, separatrix crossings, adiabatic invariant Citation: Neishtadt A. I.,  Artemyev A. V.,  Zelenyi L. M., Regular and chaotic charged particle dynamics in low frequency waves and role of separatrix crossings, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 564-574 DOI:10.1134/S1560354710040118
 Piftankin G. N.,  Treschev D. V. Coarse-grained entropy in dynamical systems Abstract Let $M$ be the phase space of a physical system. Consider the dynamics, determined by the invertible map $T: M \to M$, preserving the measure $\mu$ on $M$. Let $\nu$ be another measure on $M$, $d\nu = \rho d\mu$. Gibbs introduced the quantity $s(\rho) = − \int \rho \log \rho d \mu$ as an analog of the thermodynamical entropy. We consider a modification of the Gibbs (fine-grained) entropy the so called coarse-grained entropy. First we obtain a formula for the difference between the coarse-grained and Gibbs entropy. The main term of the difference is expressed by a functional usually referenced to as the Fisher information. Then we consider the behavior of the coarse-grained entropy as a function of time. The dynamics transforms $\nu$ in the following way: $\nu \mapsto \nu_n$, $d\nu_n = \rho \circ T^{-n} d\mu$. Hence, we obtain the sequence of densities $\rho_n = \rho \circ T^{-n}$ and the corresponding values of the Gibbs and the coarse-grained entropy. We show that while the Gibbs entropy remains constant, the coarse-grained entropy has a tendency to a growth and this growth is determined by dynamical properties of the map $T$. Finally, we give numerical calculation of the coarse-grained entropy as a function of time for systems with various dynamical properties: integrable, chaotic and with mixed dynamics and compare these calculation with theoretical statements. Keywords: Gibbs entropy, nonequilibrium thermodynamics, Lyapunov exponents, Gibbs ensemble Citation: Piftankin G. N.,  Treschev D. V., Coarse-grained entropy in dynamical systems, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 575-597 DOI:10.1134/S156035471004012X
 Taimanov I. A. Periodic magnetic geodesics on almost every energy level via variational methods Abstract For strong exact magnetic fields the action functional (i.e., the length plus the linear magnetic term) is not bounded from below on the space of closed contractible curves and the lower estimates for critical levels are derived by using the principle of throwing out cycles. It is proved that for almost every energy level the principle of throwing out cycles gives periodic magnetic geodesics on the critical levels defined by the "thrown out" cycles. Keywords: magnetic geodesics, closed extremals, calculus of variations in the large Citation: Taimanov I. A., Periodic magnetic geodesics on almost every energy level via variational methods, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 598-605 DOI:10.1134/S1560354710040131
 Vankerschaver J.,  Kanso E.,  Marsden J. E. The dynamics of a rigid body in potential flow with circulation Abstract We consider the motion of a two-dimensional body of arbitrary shape in a planar irrotational, incompressible fluid with a given amount of circulation around the body. We derive the equations of motion for this system by performing symplectic reduction with respect to the group of volume-preserving diffeomorphisms and obtain the relevant Poisson structures after a further Poisson reduction with respect to the group of translations and rotations. In this way, we recover the equations of motion given for this system by Chaplygin and Lamb, and we give a geometric interpretation for the Kutta–Zhukowski force as a curvature-related effect. In addition, we show that the motion of a rigid body with circulation can be understood as a geodesic flow on a central extension of the special Euclidian group $SE(2)$, and we relate the cocycle in the description of this central extension to a certain curvature tensor. Keywords: fluid-structure interactions, potential flow, circulation, symplectic reduction, diffeomorphism groups, oscillator group Citation: Vankerschaver J.,  Kanso E.,  Marsden J. E., The dynamics of a rigid body in potential flow with circulation, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 606-629 DOI:10.1134/S1560354710040143
 Ziglin S. L. On the absence of an additional meromorphic first integral in the Riemann problem on the motion of a homogeneous liquid ellipsoid Abstract We prove the absence of an additional meromorphic first integral in the Riemann problem on the motion of a homogeneous liquid ellipsoid with zero angular and vortex momenta in the case of zero self-gravitation. Keywords: Riemann problem, liquid ellipsoid, meromorphic first Citation: Ziglin S. L., On the absence of an additional meromorphic first integral in the Riemann problem on the motion of a homogeneous liquid ellipsoid, Regular and Chaotic Dynamics, 2010, vol. 15, no. 4-5, pp. 630-633 DOI:10.1134/S1560354710040155

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