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Paper   IPM / P / 6690
School of Physics
  Title:   Boundary Conditions as Dirac Constraints
1.  M.M. Sheikh-Jabbari
2.  A. Shirzad
  Status:   Published
  Journal: Eur. Phys. J. C
  No.:  77
  Vol.:  19
  Year:  2001
  Pages:   383-390
  Supported by:  IPM
In this article we show that boundary conditions can be treated as Lagrangian and Hamiltonian constraints. Using the Dirac method, we find that boundary conditions are equivalent to an infinite chain of second class constraints which is a new feature in the context of constrained systems. Constructing the Dirac brackets and the reduced phase space structure for different boundary conditions, we show why mode expanding and then quantizing a field theory with boundary conditions is the proper way. We also show that in a quantized field theory subjected to the mixed boundary conditions, the field components are noncommutative.

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