Phase diagram of hot QCD in an external magnetic field: Possible splitting of deconfinement and chiral transitions

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.105016· OSTI ID:21503667

Mizher, Ana Julia ^[1]; Chernodub, M N ^[2]; Fraga, Eduardo S ^[1]

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1. Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21941-972 (Brazil)
2. CNRS, Laboratoire de Mathematiques et Physique Theorique, Universite Francois-Rabelais, Federation Denis Poisson-CNRS, Parc de Grandmont, Universite de Tours, 37200 France (France)

The structure of the phase diagram for strong interactions becomes richer in the presence of a magnetic background, which enters as a new control parameter for the thermodynamics. Motivated by the relevance of this physical setting for current and future high-energy heavy-ion collision experiments and for the cosmological QCD transitions, we use the linear sigma model coupled to quarks and to Polyakov loops as an effective theory to investigate how the chiral and the deconfining transitions are affected, and present a general picture for the temperature-magnetic field phase diagram. We compute and discuss each contribution to the effective potential for the approximate order parameters, and uncover new phenomena such as the paramagnetically induced breaking of global Z{sub 3} symmetry, and possible splitting of deconfinement and chiral transitions in a strong magnetic field.

• OSTI ID: 21503667
• Journal Information: Physical Review. D, Particles Fields, Vol. 82, Issue 10; Other Information: DOI: 10.1103/PhysRevD.82.105016; (c) 2010 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
APPROXIMATIONS
CHIRALITY
COMPUTERIZED SIMULATION
HEAVY ION REACTIONS
MAGNETIC FIELDS
ORDER PARAMETERS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARKS
SIGMA MODEL
STRONG INTERACTIONS
SYMMETRY
THERMODYNAMICS
BASIC INTERACTIONS
BOSON-EXCHANGE MODELS
CALCULATION METHODS
DIAGRAMS
DIMENSIONLESS NUMBERS
FERMIONS
FIELD THEORIES
INFORMATION
INTERACTIONS
MATHEMATICAL MODELS
NUCLEAR REACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PERIPHERAL MODELS
QUANTUM FIELD THEORY
SIMULATION