منابع مشابه
NRQCD, Effective Field Theories and Potential Models
The study of the heavy quark–antiquark system is an old topic (see [1] for earlier references). Here we will concentrate on recent developments based on effective field theories. For large enough masses, these systems can be considered to be non-relativistic (NR) and are then characterized by, at least, three widely separated scales: hard (the mass m, of the heavy quarks), soft (the relative mo...
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Vacuum energies are computed in light-cone field theories to obtain effective potentials which determine vacuum condensate. Quantization surfaces interpolating between the light-like surface and the usual spatial one are useful to define the vacuum energies unambiguously. The GrossNeveu, SU(N) Thirring, and O(N) vector models are worked out in the large N limit. The vacuum energies are found to...
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Making use of a general formula for the RG improved effective (ColemanWeinberg) potential for classically conformal models and applying it to several examples of physical interest, and in particular a model of QCD coupled via quarks to a colorless scalar field, we discuss the range of validity of the effective potential as well as the issue of ‘large logarithms’ in a way different from previous...
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These lecture notes provide an elementary introduction to the study of massless inte-grable quantum field theory in 1+1 dimensions using " massless scattering ". Some previously unpublished results are also presented, including a non-perturbative study of Virasoro conserved quantities. A massless quantum field theory has no gap in the excitation spectrum. This can be seen, for example, in the L...
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It has been demonstrated that the effective potential V (φ) in a massless O(N) λφ4 model is determined completely by the renormalization group functions provided the renormalization condition d V dφ |φ=μ = λ is used. This is shown to also hold in massless scalar electrodynamics. By employing a variant of the method of characteristics, the sums contributing to the leadinglog, next-to-leading-log...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.96.125002