Mathematics – Differential Geometry
Scientific paper
2007-06-21
Vestn.St.Peterburg.Univ.1:62-70,2007
Mathematics
Differential Geometry
14 pages, 4 figures
Scientific paper
We consider the four-dimensional nonholonomic distribution defined by the 4-potential of the electromagnetic field on the manifold. This distribution has a metric tensor with the Lorentzian signature $(+,-,-,-)$, therefore, the causal structure appears as in the general relativity theory. By means of the Pontryagin's maximum principle we proved that the equations of the horizontal geodesics for this distribution are the same as the equations of motion of a charged particle in the general relativity theory. This is a Kaluza -- Klein problem of classical and quantum physics solved by methods of sub-Lorentzian geometry. We study the geodesics sphere which appears in a constant magnetic field and its singular points. Sufficiently long geodesics are not optimal solutions of the variational problem and define the nonholonomic wavefront. This wavefront is limited by a convex elliptic cone. We also study variational principle approach to the problem. The Euler -- Lagrange equations are the same as those obtained by the Pontryagin's maximum principle if the restriction of the metric tensor on the distribution is the same.
Krym Victor Revoltovich
Petrov Nikolay
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