Perturbative expansions
نویسندگان
چکیده
منابع مشابه
Perturbative Gravity Expansions
I have been asked to describe the status of perturbative expansions of gravity theories. This is a fairly active and interesting subject. I will try to be brief, because I have a lot to say about string theory, which is the main subject of my lectures at this school. The motivation for studying perturbative gravity expansions is to ascertain whether standard methods of quantum field theory are ...
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Recently a novel scheme for studying hadronic interactions beyond the threshold region was introduced by two of the authors [1]. The main objective of that work is a controlled realization of the causality and unitarity condition in a perturbative application of the chiral Lagrangian. The starting point are partial-wave dispersion relations. A generalized potential is constructed from the chira...
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Starting from the divergence pattern of perturbative quantum chromodynamics, we propose a novel, non-power series replacing the standard expansion in powers of the renormalized coupling constant a. The coefficients of the new expansion are calculable at each finite order from the Feynman diagrams, while the expansion functions, denoted as Wn(a), are defined by analytic continuation in the Borel...
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Local quark-hadron duality violations in conventional applications of the operator product expansion are proposed to have their origin in the fact that the QCD vacuum or a hadronic state is not only characterized by nonvanishing expectation values of local, gauge invariant operators but also by finite correlation lengths of the corresponding gauge invariant n-point functions. Utilizing high-res...
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It is shown that analytic properties of standard QCD perturbation theory contradict known spectral properties,and contain in particular IR generated ghost poles and cuts. As an outcome the rigorous background perturbation theory is developed and its analytic properties are shown to be in agreement with general requirements. In a limiting case of large N c , when QCD amplitudes contain only pole...
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ژورنال
عنوان ژورنال: Il Nuovo Cimento
سال: 1955
ISSN: 0029-6341,1827-6121
DOI: 10.1007/bf02856015