Ground state of the massless Nelson model without infrared cutoff in a non-Fock representation

Ground state of the massless Nelson model without infrared cutoff in a non-Fock representation
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非福克表示中无红外截止的无质量尼尔森模型的基态

DOI:
10.1142/s0129055x01000934
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发表时间:
2000
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通讯作者:
A. Arai
A. Arai
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作者:
A. Arai

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我们考虑一个量子粒子耦合到一个无质量量子标量场的模型,称为无质量Nelson模型,在满足正则换易关系的时间零场的非fock表示中。我们表明,即使在没有红外截止的情况下,该模型也具有所有耦合常数值的基态。如果没有红外截断,使用的非Fock表示等于Fock表示。
We consider a model of quantum particles coupled to a massless quantum scalar field, called the massless Nelson model, in a non-Fock representation of the time-zero fields which satisfy the canonical commutation relations. We show that the model has a ground state for all values of the coupling constant even in the case where no infrared cutoff is made. The non-Fock representation used is inequivalent to the Fock one if no infrared cutoff is made.