A new method (by Kersten, Krasil'shchik and Verbovetsky), based on the theory of differential coverings, allows to relate a system of PDEs with a differential operator in such a way that the operator maps symmetries/conserved quantities into symmetries/conserved quantities of the system of PDEs. When applied to a quasilinear first-order system of PDEs and a Dubrovin-Novikov homogeneous Hamiltonian operator the method yields conditions on the operator and the system that have interesting differential and projective geometric interpretations.
Homogeneous potentials, Lagrange's identity and Poisson geometry
International Laboratory for Mirror Symmetry(国际镜像对称实验室);National Research University Higher School of Economics, Moscow, Russia(国立高等经济大学);Beijing Institute of Mathematical Sciences and Applications, Beijing, China(北京数学与应用科学研究所)
In this paper we wonder whether a quasilinear system of PDEs of first order admits Hamiltonian formulation with local and nonlocal operators. By using the theory of differential coverings, we find differential-geometric conditions necessary to write a given system with one of the three Hamiltonian operators investigated.
The Oriented Associativity equation plays a fundamental role in the theory of Integrable Systems. In this paper we prove that the equation, besides being Hamiltonian with respect to a first-order Hamiltonian operator, has a third-order non-local homogeneous Hamiltonian operator belonging to a class which has been recently studied, thus providing a highly non-trivial example in that class and showing intriguing connections with algebraic geometry.
We propose a novel approach to contact Hamiltonian mechanics which, in contrast to the one dominating in the literature, serves also for non-trivial contact structures. In this approach Hamiltonians are no longer functions on the contact manifold M itself but sections of a line bundle over M or, equivalently, 1-homogeneous functions on a certain GL(1,R)-principal bundle P\to M which is equipped with a homogeneous symplectic form ω. In other words, our understanding of contact geometry is that it is not an `odd-dimensional cousin' of symplectic geometry but rather a part of the latter, namely `…
Hamiltonian Graph Inference Networks: Joint structure discovery and dynamics prediction for lattice Hamiltonian systems from trajectory data
School of Mathematics and Statistics(数学与统计学学院);University of Massachusetts(马萨诸塞大学);Seoul National University(首尔国立大学);Northeast Normal University(东北师范大学);Great Bay University(大贝大学)
In the presence of the homogeneous electric field ${\bf E}$ and the homogeneous perpendicular magnetic field ${\bf B}$, the classical trajectory of a quantum particle on ${\mathbb R}^2$ moves with drift velocity $α$ which is perpendicular to the electric and magnetic fields. For such Hamiltonians the absence of the embedded eigenvalues of perturbed Hamiltonian has been conjectured. In this paper one proves this conjecture for the perturbations $V(x, y)$ which have sufficiently small support in direction of drift velocity.
Liouville-Arnold theorem for homogeneous symplectic and contact Hamiltonian systems
Centre for Automation and Robotics, Spanish National Research Council (CSIC)(西班牙国家研究理事会自动化与机器人中心);Institute of Mathematical Sciences, Spanish National Research Council (CSIC)(西班牙国家研究理事会数学科学研究所);Royal Academy of Exact, Physical and Natural Sciences(皇家精确、物理与自然科学学院);Department of Quantitative Methods, CUNEF University(CUNEF大学定量方法系);Institute of Mathematics of the Polish Academy of Sciences (IM PAN)(波兰科学院数学研究所)
The simplest Tree-Tensor-States (TTS) respecting the Parity and the Time-Reversal symmetries are studied in order to describe the ground states of Long-Ranged Quantum Spin Chains with or without disorder. Explicit formulas are given for the one-point and two-point reduced density matrices that allow to compute any one-spin and two-spin observable. For Hamiltonians containing only one-body and two-body contributions, the energy of the TTS can be then evaluated and minimized in order to obtain the optimal parameters of the TTS. This variational optimization of the TTS parameters is compared with…