Physics – Quantum Physics
Scientific paper
2004-07-15
J.Phys.A38:R1,2005
Physics
Quantum Physics
53 pages LaTeX, no figures
Scientific paper
10.1088/0305-4470/38/4/R01
In [Phys. Rep. 137, 49 (1986)] John S. Bell proposed how to associate particle trajectories with a lattice quantum field theory, yielding what can be regarded as a |Psi|^2-distributed Markov process on the appropriate configuration space. A similar process can be defined in the continuum, for more or less any regularized quantum field theory; such processes we call Bell-type quantum field theories. We describe methods for explicitly constructing these processes. These concern, in addition to the definition of the Markov processes, the efficient calculation of jump rates, how to obtain the process from the processes corresponding to the free and interaction Hamiltonian alone, and how to obtain the free process from the free Hamiltonian or, alternatively, from the one-particle process by a construction analogous to "second quantization." As an example, we consider the process for a second quantized Dirac field in an external electromagnetic field.
Duerr Detlef
Goldstein Sheldon
Tumulka Roderich
Zanghi Nino
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