期刊
ACTA PHYSICA POLONICA B
卷 43, 期 9, 页码 1843-1862出版社
WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO
DOI: 10.5506/APhysPolB.43.1843
关键词
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The concept of effective particles as degrees of freedom in a relativistic quantum field theory is defined using a non-perturbative renormalization group procedure for Hamiltonians. However, every candidate for a basic physical theory appears to require an initial perturbative search for the set of interaction terms that may provide a basis with which the full effective theory Hamiltonian could be constructed in a series of successive approximations. This article describes the required perturbative expansion and illustrates it with a set of general 4th-order formulae.
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