QCD at High Temperature: Results from Lattice Simulations with an Imaginary μ (original) (raw)
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We propose a set of lattice measurements which could test whether the deconfined, quark-gluon plasma, phase of QCD shows strong coupling aspects at temperatures a few times the critical temperature for deconfinement, in the region where the conformal anomaly becomes unimportant. The measurements refer to twist-two operators which are not protected by symmetries and which in a strong-coupling scenario would develop large, negative, anomalous dimensions, resulting in a strong suppression of the respective lattice expectation values in the continuum limit. Special emphasis is put on the respective operator with lowest spin (the spin-2 operator orthogonal to the energy-momentum tensor within the renormalization flow) and on the case of quenched QCD, where this operator is known for arbitrary values of the coupling: this is the quark energy-momentum tensor. The proposed lattice measurements could also test whether the plasma constituents are pointlike (as expected at weak coupling), or not.
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Nuclear Physics B - Proceedings Supplements, 2005
The thermal effects on the quark-gluon mixed condensate g qσµν Gµν q , which is another chiral order parameter, are studied using the SU(3)c lattice QCD with the Kogut-Susskind fermion at the quenched level. We perform the accurate measurement of g qσµν Gµν q as well as qq for 0 < ∼ T < ∼ 500MeV. We observe the sharp decrease of both the condensates around Tc ≃ 280MeV, while the thermal effects below Tc are found to be weak. We also find that the ratio m 2 0 ≡ g qσµν Gµν q / qq is almost independent of the temperature even in the very vicinity of Tc, which indicates that the two condensates have nontrivial similarity in the chiral behaviors. We also present the correlation between the condensates and the Polyakov loop to understand the vacuum structure of QCD.