Bohmian Trajectories for Hamiltonians with Interior–Boundary Conditions

  • Detlef Dürr
  • Sheldon Goldstein
  • Stefan Teufel
  • Roderich TumulkaEmail author
  • Nino Zanghì


Recently, there has been progress in developing interior–boundary conditions (IBCs) as a technique of avoiding the problem of ultraviolet divergence in non-relativistic quantum field theories while treating space as a continuum and electrons as point particles. An IBC can be expressed in the particle-position representation of a Fock vector \(\psi \) as a condition on the values of \(\psi \) on the set of collision configurations, and the corresponding Hamiltonian is defined on a domain of vectors satisfying this condition. We describe here how Bohmian mechanics can be extended to this type of Hamiltonian. In fact, part of the development of IBCs was inspired by the Bohmian picture. Particle creation and annihilation correspond to jumps in configuration space; the annihilation is deterministic and occurs when two particles (of the appropriate species) meet, whereas the creation is stochastic and occurs at a rate dictated by the demand for the equivariance of the \(|\psi |^2\) distribution, time reversal symmetry, and the Markov property. The process is closely related to processes known as Bell-type quantum field theories.


Regularization of quantum field theory Particle creation and annihilation Bohmian mechanics Bell-type quantum field theory Schrödinger operator with boundary condition Galilean transformation 



We thank Stefan Keppeler, Jonas Lampart, Ruadhan O’Flanagan, and Julian Schmidt for helpful discussions.


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Authors and Affiliations

  1. 1.Mathematisches InstitutLudwig-Maximilians-UniversitätMünchenGermany
  2. 2.Departments of Mathematics, Physics and PhilosophyRutgers UniversityPiscatawayUSA
  3. 3.Mathematisches InstitutEberhard-Karls-UniversitätTübingenGermany
  4. 4.Dipartimento di Fisica dell’Università di Genova and INFN sezione di GenovaGenovaItaly

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