1 9 Ju l 1 99 9 Correlation and response in the Backgammon model : the Ehrenfest legacy by

Models.

Dynamical urn models, such as the Ehrenfest model, have played an important role in the early days of statistical mechanics. Dynamical many-urn models generalize the former models in two respects: the number of urns is macroscopic, and thermal effects are included. These many-urn models are exactly solvable in the mean-field geometry. They allow analytical investigations of the characteristic f...

ar X iv : n uc l - th / 9 90 60 29 v 3 1 5 Ju l 1 99 9 1 Quark Matter ’ 99 — Theoretical Summary : What Next ?

- th / 9 90 60 29 v 2 1 1 Ju l 1 99 9 1 Quark Matter ’ 99 — Theoretical Summary : What Next ?

ar X iv : h ep - l at / 9 90 70 04 v 1 1 1 Ju l 1 99 9 The Role of the Polyakov loop in Finite Density QCD

We study the behavior of the fermion determinant at finite temperature and chemical potential, as a function of the Polyakov loop. The phase of the determinant is correlated with the imaginary part of the Polyakov loop. This correlation and its consequences are considered in static QCD, in a toy model of free quarks in a constant A 0 background, and in simulations constraining the imaginary par...

ar X iv : h ep - t h / 99 07 16 1 v 1 1 9 Ju l 1 99 9 Remarks on Infrared Dynamics in QED 3

In this work we study how the infrared sector of the interaction Hamiltonian can affect the construction of the S matrix operator of QED in (2+1) dimensions.