Chiral condensate, master field and all that in QCD2 (N → ∞)

The Master Field in Generalised QCD2

As an illustration of the formalism of the master field we consider generalised QCD2. We show how Wilson Loop averages for an arbitrary contour can be computed explicitly and with some ease. A generalised Hopf equation is shown to govern the behaviour of the eigenvalue density of Wilson loops. The collective field description of the theory is therefore deduced. Finally, the non-trivial master g...

Large N QCD – Continuum Reduction and Chiral Condensate

Continuum reduction in large N QCD enables one to extract physical quantities in the N → ∞ limit of QCD by working in small physics volumes. The computation of chiral condensate is an example of such a calculation.

Two-dimensional field theory description of a disoriented chiral condensate.

We consider the effective 1 + 1-dimensional chiral theory describing fluctuations of the order parameter of the Disoriented Chiral Condensate (DCC) which can be formed in the central rapidity region in a relativistic nucleus-nucleus or nucleon-nucleon collisions at high energy. Using 1+1-dimensional reduction of QCD at high energies and assuming spin polarization of DDC one can find the Wess-Zu...

Chiral Lagrangians and quark condensate in nuclei

We study the evolution with density of the quark condensate in the nuclear medium with interacting nucleons and including the short range correlations. We work with two chiral models, the linear sigma model and the non-linear one. For the last one we use two versions, one which does not satisfy PCAC, and another one which does. We show that the quark condensate, as other observables, is indepen...

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