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arXiv 0704.0066hep-th
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动量图象中的拉格朗日量子场论。IV。自由场的对易关系

Lagrangian quantum field theory in momentum picture. IV. Commutation relations for free fields

Bozhidar Z. Iliev

摘要:

本文从数学观点考虑自由场(标量场、旋量场和矢量场)的拉格朗日量子理论中可能的(代数)对易关系。作为这些关系的来源采用海森堡方程/关系的动力学变量和一个特定的条件的唯一性的运营商的动力学变量(相对于一些类的拉格朗日)。指出仿交换关系或其某些推广是所有海森堡方程成立的最一般的关系。同时满足海森堡方程和唯一性要求变成不可能的。这个问题是通过重新定义的动态变量,类似于正常的排序过程,并包含它作为一个特殊情况下解决。这就意味着容许对易关系的相应变化。真空概念的引入缩小了可能的对易关系类;特别是,上述动力学变量的重新定义被简化为正常序。作为对这一类别的最后一个限制,要求存在计算真空平均值的有效程序。标准的双线性交换关系被指出是唯一已知的满足所有上述条件,并不矛盾的现有数据。

英文摘要:

Possible (algebraic) commutation relations in the Lagrangian quantum theory of free (scalar, spinor and vector) fields are considered from mathematical view-point. As sources of these relations are employed the Heisenberg equations/relations for the dynamical variables and a specific condition for uniqueness of the operators of the dynamical variables (with respect to some class of Lagrangians). The paracommutation relations or some their generalizations are pointed as the most general ones that entail the validity of all Heisenberg equations. The simultaneous fulfillment of the Heisenberg equations and the uniqueness requirement turn to be impossible. This problem is solved via a redefinition of the dynamical variables, similar to the normal ordering procedure and containing it as a special case. That implies corresponding changes in the admissible commutation relations. The introduction of the concept of the vacuum makes narrow the class of the possible commutation relations; in particular, the mentioned redefinition of the dynamical variables is reduced to normal ordering. As a last restriction on that class is imposed the requirement for existing of an effective procedure for calculating vacuum mean values. The standard bilinear commutation relations are pointed as the only known ones that satisfy all of the mentioned conditions and do not contradict to the existing data.

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