TY  - JOUR
AU  - Bali, G.S.
AU  - Bruckmann, F.
AU  - Endrödi, G.
AU  - Fodor, Z.
AU  - Katz, S.D.
AU  - Krieg, S.
AU  - Schäfer, A.
AU  - Szabó, K.K.
TI  - The QCD phase diagram for external magnetic fields
JO  - Journal of high energy physics
SN  - 1126-6708
CY  - Berlin
PB  - Springer
M1  - PreJuSER-20515
SP  - 44
PY  - 2012
N1  - 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.
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000301451200044
DO  - DOI:10.1007/JHEP02(2012)044
UR  - https://juser.fz-juelich.de/record/20515
ER  -