Time Ordering, Energy Ordering, and Factorization
arXiv:hep-ph/9907490 · doi:10.1063/1.533356
Abstract
Relations between integrals of time-ordered product of operators, and their representation in terms of energy-ordered products are studied. Both can be decomposed into irreducible factors and these relations are discussed as well. The energy-ordered representation was invented to separate various infrared contributions in gauge theories. It is shown that the irreducible time-ordered expressions can be used to accomplish the same purpose. Besides, it has the added advantage of being factorizable.
16 pages in revtex