Physics – Mathematical Physics
Scientific paper
2010-03-19
Physics
Mathematical Physics
To appear in Correlation Optics, special issue of "Advances in Optical Technologies"
Scientific paper
We introduce a concept of asymptotic principal values which enables us to handle rigorously singular integrals of higher-order poles encountered in the computation of various quantities based on correlation functions of a vacuum. Several theorems on asymptotic principal values are proved and they are expected to become bases for investigating and developing some class of regularization methods for singular integrals. We make use of these theorems for analyzing mutual relations between some regularization methods, including a method naturally derived from asymptotic principal values. It turns out that the concept of asymptotic principal values and the theorems for them are quite useful in this type of analysis, providing a suitable language to describe what is discarded and what is retained in each regularization method.
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