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Inverse magnetic catalysis in the (2+1)-flavor Nambu–Jona-Lasinio and Polyakov–Nambu–Jona-Lasinio models

M. Ferreira1,3, P. Costa1, O. Lourenço2, T. Frederico3, and C. Providência1

  • 1Centro de Física Computacional, Department of Physics, University of Coimbra, P-3004–516 Coimbra, Portugal
  • 2Departamento de Ciências da Natureza, Matemática e Educação, CCA, Universidade Federal de São Carlos, 13600-970 Araras, São Paulo, Brazil
  • 3Instituto Tecnológico de Aeronáutica, 12.228-900 São José dos Campos, São Paulo, Brazil

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Phys. Rev. D 89, 116011 – Published 16 June, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.116011

Abstract

The QCD phase diagram at zero chemical potential and finite temperature subject to an external magnetic field is studied within the three-flavor Nambu–Jona-Lasinio (NJL) model and the NJL model with the Polyakov loop. A scalar coupling parameter dependent on the magnetic field intensity is considered. The scalar coupling has been fitted so that the lattice QCD pseudocritical chiral transition temperatures are reproduced and in the limit of large magnetic field decreases with the inverse of the magnetic field intensity. This dependence of the coupling allows us to reproduce the lattice QCD results with respect to the quark condensates and Polyakov loop: due to the magnetic field the quark condensates are enhanced at low and high temperatures and suppressed for temperatures close to the transition temperatures and the Polyakov loop increases with the magnetic field.

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Deconfinement and chiral restoration within the SU(3) Polyakov–Nambu–Jona-Lasinio and entangled Polyakov–Nambu–Jona-Lasinio models in an external magnetic field

Márcio Ferreira, Pedro Costa, Débora P. Menezes, Constança Providência, and Norberto N. Scoccola
Phys. Rev. D 89, 016002 (2014)

Article Text

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Phys. Rev. D 89, 116011– Published 16 June, 2014
  • Received 23 April 2014

© 2014 American Physical Society

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