出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study QCD with two staggered Dirac fermions both in the fundamental (QCD) and the adjoint
representation (aQCD) near the chiral transition. The aim is to nd the universality class of
the chiral transition and to verify Goldstone effects below the transition. We investigate aQCD,
because in that theory the deconnement and the chiral transitions occur at different temperatures
Td < Tc. Here, we show that the scaling behaviour of the chiral condensate in the vicinity of
bc is in full agreeement with that of the 3d O(2) universality class. In the region Td < T < Tc
we conrm the quark mass dependence of the chiral condensate which is expected due to the
existence of Goldstone modes like in 3d O(N) spin models. For fundamental QCD we use the
p4-action. Here, we nd Goldstone effects below Tc like in aQCD and the 3d O(N) spin models,
however no O(2)=O(4) scaling near the chiral transition point. The result for QCD may be a
consequence of the coincidence of the deconnement transition with the chiral transition.
