Time-independent stochastic quantization, Dyson-Schwinger equations, and infrared critical exponents in QCD

Daniel Zwanziger

    Research output: Contribution to journalArticle

    Abstract

    We derive the equations of time-independent stochastic quantization, without reference to an unphysical fifth time, from the principle of gauge equivalence. It asserts that probability distributions P that give the same expectation values for gauge-invariant observables 〈W〉 = ∫dAWP are physically indistinguishable. This method escapes the Gribov critique. We derive an exact system of equations that closely resembles the Dyson-Schwinger equations of Faddeev-Popov theory. The system is truncated and solved nonperturbatively, by means of a power law ansatz, for the critical exponents that characterize the asymptotic form at k≈0 of the gluon propagator in Landau gauge. For the transverse and longitudinal parts, we find, respectively, D T ∼(k 2) -1-α T≈(k 2) 0.043, suppressed and in fact vanishing, though weakly, and D L∼a(k 2) -1-α L ≈ a(k 2) -1.521, enhanced, with α T= -2α L. Although the longitudinal part vanishes with the gauge parameter a in the Landau-gauge limit a→0 there are vertices of order a -1 so, counterintuitively, the longitudinal part of the gluon propagator does contribute in internal lines in the Landau gauge, replacing the ghost that occurs in Faddeev-Popov theory. We compare our results with the corresponding results in Faddeev-Popov theory.

    Original languageEnglish (US)
    Article number105001
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume67
    Issue number10
    DOIs
    StatePublished - May 15 2003

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    quantum chromodynamics
    exponents
    propagation
    ghosts
    escape
    equivalence
    apexes

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Time-independent stochastic quantization, Dyson-Schwinger equations, and infrared critical exponents in QCD. / Zwanziger, Daniel.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 67, No. 10, 105001, 15.05.2003.

    Research output: Contribution to journalArticle

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