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The strongly interacting Quark Gluon Plasma, and the critical behaviour of QCD at imaginary chemical potential

D'Elia, Massimo and Renzo, Francesco Di and Lombardo, Maria Paola (2007) The strongly interacting Quark Gluon Plasma, and the critical behaviour of QCD at imaginary chemical potential. Physical review. D: Particles and fields, 76 . p. 114509. ISSN 0556-2821

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Abstract

We explore the highly non-perturbative hot region of the QCD phase diagram close to Tc by use of an imaginary chemical potential mu which avoids the sign problem. The number density and the quark number susceptibility are consistent with a critical behaviour associated with the transition line in the negative mu^2 half-plane. We compare the analytic continuation of these results with various phenomenological models, none of which provides a satisfactory description of data, a failure on which we make some comments. These results complement and extend the information obtained via the analysis of the susceptibilities evaluated at zero mu, yielding a simple description of the candidate strongly interacting QGP phase. As a byproduct of our analysis we investigate the Polyakov loop and its hermitian conjugate. Our data offer a vivid evidence of the importance of the complex nature of the functional integral measure, which results in L (mu) ne \bar L(mu) for a real chemical potential.

Item Type: Article
Additional Information: Imported from arXiv
Subjects: Area02 - Scienze fisiche > FIS/02 - Fisica teorica, modelli e metodi matematici
Divisions: Dipartimenti (from 2013) > DIPARTIMENTO DI FISICA
Depositing User: dott.ssa Sandra Faita
Date Deposited: 28 Oct 2013 23:43
Last Modified: 28 Oct 2013 23:43
URI: http://eprints.adm.unipi.it/id/eprint/1578

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