The QCD phase diagram for external magnetic fields

By Gunnar S. Bali, F. Bruckmann, Gergely Endrodi, Zoltán Fodor, Sándor D. Katz, S. Krieg, Andreas Schäfer, Kálmán K. Szabó. 2011

499 citations recorded by the source corpus.

A bstractThe 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 Nf = 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 Nt = 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 Tc significantly decreases with increasing magnetic field. This is in conflict with various model calculations that predict an increasing Tc(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 eB ≈ 1 GeV2, and that the transition strength increases mildly up to this eB ≈ 1 GeV2.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3411d09f5ed88d549e4d46e220142d06ccf57070

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In Nuclear and High Energy Physics

Citations in the corpus

Polyakov loop modeling for hot QCD (2017, background): “The lattice-QCD simulation under strong magnetic fields [120, 121], however, have revealed that two crossovers occur like not the right but the left panel of Fig.”
The QCD equation of state in background magnetic fields (2014, methodology): “We again conclude that the B-dependent divergence is absent from the condensate [16, 21].”
Inverse magnetic catalysis and the Polyakov loop (2013, background): “The discrepancy between the different lattice results suggests that the use of fine grids and light enough quarks [20] might be essential for correctly describing the effect.”
QCD at finite temperature and chemical potential from Dyson–Schwinger equations (2018, background): “Perhaps surprisingly, results from lattice QCD also demonstrate that the opposite effect happens for large enough temperatures: the dynamical mass generation is reduced and consequently the transition temperatures for the crossover to the chirally restored phase is decreased [76–80].”
Magnetic Catalysis: A Review (2012, methodology): “Because of a poorly understood interplay between the dynamics responsible for the quark (de-)confinement on the one han d and the magnetic catalysis on the other, there are a lot of uncertainties abou t the precise role of the magnetic field in this case [121, 144, 2, 25, 146, 67, 68, 69, 77 , 78, 3”