Bruckmann, Falk and Endrodi, Gergely and Kovacs, Tamas G. (2013) Inverse magnetic catalysis and the Polyakov loop. JOURNAL OF HIGH ENERGY PHYSICS (4): 112. ISSN 1029-8479,
Full text not available from this repository. (Request a copy)Abstract
We study the physical mechanism of how an external magnetic field influences the QCD quark condensate. Two competing mechanisms are identified, both relying on the interaction between the magnetic field and the low quark modes. While the coupling to valence quarks enhances the condensate, the interaction with sea quarks suppresses it in the transition region. The latter "sea effect" acts by ordering the Polyakov loop and, thereby, reduces the number of small Dirac eigenmodes and the condensate. It is most effective around the transition temperature, where the Polyakov loop effective potential is flat and a small correction to it by the magnetic field can have a significant effect. Around the critical temperature, the sea suppression overwhelms the valence enhancement, resulting in a net suppression of the condensate, named inverse magnetic catalysis. We support this physical picture by lattice simulations including continuum extrapolated results on the Polyakov loop as a function of temperature and magnetic field. We argue that taking into account the increase in the Polyakov loop and its interaction with the low-lying modes is essential to obtain the full physical picture, and should be incorporated in effective models for the description of QCD in magnetic fields in the transition region.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHIRAL-SYMMETRY; TRANSITION; MODEL; TEMPERATURE; BREAKING; FIELDS; Lattice QCD; Phase Diagram of QCD |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 17 Apr 2020 07:22 |
| Last Modified: | 17 Apr 2020 07:22 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16855 |
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