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Symmetries, variational principles, and quantum dynamics. (English) Zbl 1065.81542
Summary: We describe the role of symmetries in formation of quantum dynamics. A quantum version of d’Alembert’s principle is proposed to take into account the symmetry constrains more exact. It is argued that the time reversibility of quantum process, as the quantum analogy of d’Alembert’s principle, makes the measure of the corresponding path integral $$\delta$$-like. The argument of this $$\delta$$-function is the sum of all classical forces of the problem under consideration plus the random force of quantum excitations. Such measure establishes the one-to-one correspondence with classical mechanics and, for this reason, allows a free choice of the useful dynamical variables. The analysis shows that choosing the action-angle variables, one may get to the free-from-divergences quantum field theory. Moreover, one can try to get an independence from necessity to extract the degrees of freedom constrained by the symmetry. These properties of new quantization scheme are vitally essential for such theories as the non-Abelian Yang-Mills gauge theory and quantum gravity.
##### MSC:
 81Q05 Closed and approximate solutions to the Schrödinger, Dirac, Klein-Gordon and other equations of quantum mechanics 81R20 Covariant wave equations in quantum theory, relativistic quantum mechanics 49S05 Variational principles of physics (should also be assigned at least one other classification number in Section 49-XX)
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