Indications for Gluon Condensation From Nonperturbative Flow Equations
نویسنده
چکیده
We employ nonperturbative flow equations for the description of the effective action in Yang-Mills theories. We find that the perturbative vacuum with vanishing gauge field strength does not correspond to the minimum of the Euclidean effective action. The true ground state is characterized by a nonvanishing gluon condensate.
منابع مشابه
Gluon Condensation in Nonperturbative Flow Equations
We employ nonperturbative flow equations for an investigation of the effective action in Yang-Mills theories. We compute the effective action Γ[B] for constant color magnetic fields B and examine Savvidy’s conjecture of an unstable perturbative vacuum. Our results indicate that the absolute minimum of Γ[B] occurs for B = 0. Gluon condensation is described by a nonvanishing expectation value of ...
متن کاملIntegrating out Gluons in Flow Equations
We present an exact nonperturbative flow equation for the average action for quarks which incorporates the effects of gluon fluctuations. With suitable truncations this allows one to compute effective multiquark interactions in dependence on an infrared scale k. Our method amounts to integrating out the gluons with momenta larger than k.
متن کاملEffective field theory approach to parton-hadron conversion in high energy QCD processes.
A QCD based effective action is constructed to describe the dynamics of confinement and symmetry breaking in the process of parton-hadron conversion. The deconfined quark and gluon degrees of freedom of the perturbative QCD vacuum are coupled to color singlet collective fields representing the non-perturbative vacuum with broken scale and chiral symmetry. The effective action recovers QCD with ...
متن کاملThe Model for Qcd Running Coupling Constant with Dynamically Generated Mass and Enhancement in the Infrared Region
Nonperturbative studies of the strong running coupling constant in the infrared region are discussed. Starting from the analyses of the Dyson – Schwinger equations in the gauge sector of QCD, the conclusion is made on an incomplete fixing of the perturbation theory summation ambiguity within ”(forced) analytization procedure” (called also a dispersive approach). A minimal model for ᾱs(q 2) is p...
متن کاملBaby steps beyond rainbow-ladder
We discuss the impact of including corrections beyond single gluon exchange in light mesons within the nonperturbative framework of DysonSchwinger equations (DSE) and Bethe-Salpeter equations (BSE). We do this by considering unquenching effects in the form of hadronic resonance contributions, notably pion exchange, and by the inclusion of the dominant gluon self-interactions to the quark-gluon ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1995