Cold, dense nuclear matter in a SU(2) parity doublet model
- Instituto de Fisica, Universidade Federal do Rio de Janeiro, C.P. 68.528, 21941-972 Rio de Janeiro, RJ (Brazil)
- Gesellschaft fuer Schwerionenforschung, D-64291 Darmstadt (Germany)
- Institut fuer Theoretische Physik, J. W. Goethe Universitaet, D-60438 Frankfurt (Germany)
- Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
We study dense nuclear matter and the chiral phase transition in a SU(2) parity doublet model at zero temperature. The model is defined by adding the chiral partner of the nucleon, the N{sup '}, to the linear sigma model, treating the mass of the N{sup '} as an unknown free parameter. The parity doublet model gives a reasonable description of the properties of cold nuclear matter, and avoids unphysical behavior present in the standard SU(2) linear sigma model. If the N{sup '} is identified as the N{sup '}(1535), the parity doublet model shows a first order phase transition to a chirally restored phase at large densities, {rho}{approx_equal}10{rho}{sub 0}, defining the transition by the degeneracy of the masses of the nucleon and the N{sup '}. If the mass of the N{sup '} is chosen to be 1.2 GeV, then the critical density of the chiral phase transition is lowered to three times normal nuclear matter density, and for physical values of the pion mass, the first order transition turns into a smooth crossover.
- OSTI ID:
- 20995319
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 75, Issue 5; Other Information: DOI: 10.1103/PhysRevC.75.055202; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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