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math-ph2004★ 1 cited
Ultracoherence and Canonical Transformations
Joachim Kupsch, Subhashish Banerjee
The (in)finite dimensional symplectic group of homogeneous canonical transformations is represented on the bosonic Fock space by the action of the group on the ultracoherent vector…
math-ph2004
Superselection rules induced by infrared divergence
Joachim Kupsch
Superselection rules induced by the interaction with a mass zero Boson field are investigated for a class of exactly soluble Hamiltonian models. The calculations apply as well to d…