Annales De L Institut Henri Poincare-physique Theorique
Classical limit of a quantum particle in an external Yang-Mills field
Ugo Moschella
Abstract
It is studied the classical limit of a quantum particle in an external non-abelian gauge field. It is shown that the unitary group describing the quantum fluctuations around any classic phase orbit has a classical limit when h tends to zero under very general conditions on the potentials. It is also proved the self-adjointness of the Hamilton's operator of the quantum theory for a large class of potentials. Some applications of the theory are finally exposed On etudie la limite classique d'une particule quantique dans un champ exterieur non abelien. On demontre que l'existence de la limite classique du groupe unitaire qui decrit les fluctuations quantiques autour d'une orbite classique quelconque est assuree par des conditions peu restrictives sur les potentiels. On demontre que l'operateur hamiltonien de la theorie quantique est auto-adjoint pour une large classe de potentiels