A number of arguments purport to show that quantum field theory cannot be given an interpretation in terms of localizable particles. We show, in light of such arguments, that the classical \(\hbar \rightarrow 0\) limit can aid our understanding of the particle content of quantum field theories. In particular, we demonstrate that for the massive Klein–Gordon field, the classical limits of number operators can be understood to encode local information about particles in the corresponding classical field theory.

中文翻译：

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量子场论经典极限中的可定位粒子

许多论据表明，量子场论不能用可定位粒子来解释。根据这样的论点，我们证明了经典的\（\ hbar \ rightarrow 0 \）限制可以帮助我们理解量子场论的粒子含量。尤其是，我们证明了对于庞大的Klein-Gordon场，在相应的经典场论中，可以将数算子的经典极限理解为对有关粒子的局部信息进行编码。