Journal Article

PreJuSER-20515

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The QCD phase diagram for external magnetic fields

Bali, G. S. ; Bruckmann, F. ; Endrödi, G. ; Fodor, Z.FZJ* ; Katz, S. D. ; Krieg, S.FZJ* ; Schäfer, A. ; Szabó, K. K.

2012
Springer Berlin

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Please use a persistent id in citations: doi:10.1007/JHEP02(2012)044

Abstract: The effect of an external (electro) magnetic field on the finite temperature transition of QCD is studied. We generate configurations at various values of the quantized magnetic flux with N-f = 2 + 1 flavors of stout smeared staggered quarks, with physical masses. Thermodynamic observables including the chiral condensate and susceptibility, and the strange quark number susceptibility are measured as functions of the field strength. We perform the renormalization of the studied observables and extrapolate the results to the continuum limit using N-t = 6, 8 and 10 lattices. We also check for finite volume effects using various lattice volumes. We find from all of our observables that the transition temperature T c significantly decreases with increasing magnetic field. This is in conflict with various model calculations that predict an increasing T-c(B). From a finite volume scaling analysis we find that the analytic crossover that is present at B = 0 persists up to our largest magnetic fields e B approximate to 1 GeV2, and that the transition strength increases mildly up to this e B approximate to 1 GeV2.

Keyword(s): J ; Lattice QCD (auto) ; Lattice Quantum Field Theory (auto)

Note: This work has been supported by DFG grants SFB-TR 55, FO 502/1-2 and BR 2872/4-2, the EU grants (FP7/2007-2013)/ERC no 208740 and PITN-GA-2009-238353 (ITN STRONGnet). Computations were carried out on the GPU cluster at the Eotvos University in Budapest and on the Bluegene/P at FZ Julich. We thank Ferenc Niedermayer for useful discussions, interesting ideas and for careful reading of the manuscript. G. E. would like to thank Massimo D'Elia, Swagato Mukherjee, Daniel Nogradi, Tamas Kovacs and Igor Shovkovy for useful discussions.

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Contributing Institute(s):

1. Jülich Supercomputing Centre (JSC)

Research Program(s):

1. Scientific Computing (FUEK411) (FUEK411)
2. 411 - Computational Science and Mathematical Methods (POF2-411) (POF2-411)
3. QCDTHERMO - QCD thermodynamics on the lattice (208740) (208740)
4. STRONGNET - Strong Interaction Supercomputing Training Network (238353) (238353)

Appears in the scientific report 2012

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Database coverage:
Current Contents - Social and Behavioral Sciences ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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