Exploring the QCD phase diagram

  • Lattice simulations employing reweighting and Taylor expansion techniques have predicted a (m;T)-phase diagram according to general expectations, with an analytic quark-hadron crossover at m =0 turning into a first order transition at some critical chemical potential mE. By contrast, recent simulations using imgainary m followed by analytic continuation obtained a critical structure in the fmu;d;ms;T;mg parameter space favouring the absence of a critical point and first order line. I review the evidence for the latter scenario, arguing that the various raw data are not inconsistent with each other. Rather, the discrepancy appears when attempting to extract continuum results from the coarse (Nt =4) lattices simulated so far, and can be explained by cut-off effects. New (as yet unpublished) data are presented, which for Nf = 3 and on Nt = 4 confirm the scenario without a critical point. Moreover, simulations on finer Nt = 6 lattices show that even if there is a critical point, continuum extrapolation moves it to significantly larger values of mE than anticipated on coarse lattices.

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Metadaten
Author:Owe PhilipsenORCiDGND
URN:urn:nbn:de:hebis:30:3-272841
ISSN:1824-8039
Parent Title (English):Proceedings of Science
Publisher:Scuola Internazionale Superiore di Studi Avanzati, SISSA
Place of publication:Trieste
Document Type:Conference Proceeding
Language:English
Date of Publication (online):2012/12/17
Year of first Publication:2007
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2012/12/17
Volume:2007
Issue:CPOD07: 028
Page Number:10
Note:
Critical Point and Onset of Deconfinement - 4th International Workshop, July 9 - 13, 2007, Darmstadt, Germany
HeBIS-PPN:316100900
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung-Keine kommerzielle Nutzung-Weitergabe unter gleichen Bedingungen