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The strong coupling in the nonperturbative and near-perturbative regimes
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We use analytic continuation to extend the gauge/gravity duality nonperturbative description of the strong force coupling into the transition, near-perturbative, regime where perturbative effects become important. By excluding the unphysical region in coupling space from the flow of singularities in the complex plane, we derive a specific relation between the scales relevant at large and short distances; this relation is uniquely fixed by requiring maximal analyticity. The unified effective coupling model gives an accurate description of the data in the nonperturbative and the near-perturbative regions.
Forward citations
Cited by 2 Pith papers
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Asymptotic gauge symmetry and UV extension of the nonperturbative coupling in holographic QCD
A holographic effective strong coupling with momentum-dependent confinement strength and ultraviolet boundary conditions reproduces alpha_s data at all scales and gives alpha_s(MZ) = 0.1161 +/- 0.0017.
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Insight on confinement from the QCD effective charge
Assigning the imaginary poles of α_g1 to parton propagators produces long-distance damping e^{-Λ_s|x|/√2}|x|^{-5/2+d_a}, interpreting confinement as Green's-function suppression.
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