Abstract
The canonical formalism for a neutral scalar field on a lightlike hyperplane is studied in terms of Dirac's theory for constrained Hamiltonian systems. The field and its canonical momentum on the plane are restricted to appropriate functional spaces and are expanded into wave packets. The formalism becomes simpler by the absence of unphysical modes forP−=0. After quantization we discuss how the Wightman function loses its dynamical information when it is restricted to the lightlike plane.
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