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arXiv quant-ph/0407116quant-ph
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Bell型量子场论

Bell-Type Quantum Field Theories

Detlef Duerr, Sheldon Goldstein, Roderich Tumulka, Nino Zanghi

摘要:

在[Phys.Rep.137,49(1986)] John S.贝尔提出了如何将粒子轨道与格点量子场论联系起来,从而在适当的位形空间上产生一个可被视为|Psi| ^2分布的马尔可夫过程。对于或多或少任何正则化的量子场论,在连续统中也可以定义一个类似的过程;这样的过程我们称之为贝尔型量子场论。我们描述的方法,明确构建这些过程。除了马尔可夫过程的定义之外,这些问题还涉及跳跃率的有效计算,如何从单独对应于自由和相互作用哈密顿量的过程中获得过程,以及如何从自由哈密顿量或通过类似于“第二量子化”的构造从单粒子过程中获得自由过程。“作为一个例子,我们考虑了外部电磁场中第二量子化狄拉克场的过程。

英文摘要:

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.

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