A Soft Bag Quark-Meson Coupling Model for High Density Nuclear Matter
- Instituto de Fisica e Matematica, Universidade Federal de Pelotas, CEP 96010-900 Pelotas, Rio Grande do Sul (Brazil)
- Instituto de Fisica, Universidade Federal do Rio Grande do Sul, CEP 91501-970 Porto Alegre, Rio Grande do Sul (Brazil)
The structure of high density nuclear matter is studied in the framework of a new approach, a mean-field description of non-overlapping neutron and proton bags with soft surfaces bound by the self-consistent exchange of the {sigma}, {omega} and {rho} meson fields. We consider in this formulation each bag with an internal region, where quarks are free, a finite surface region, where the quark wave functions are gradually suppressed, and an exterior region, where the quark wave functions vanish. The finite surface region with a typical scale of about half a Fermi models the smooth transition region between the perturbative and non-perturbative vacua, as expected from a gradual outside-inside restoration of chiral symmetry. As an application we determine the structure of the equation of state for neutron stars. We then consistently include in the formulation lepton degrees of freedom, the chemical equilibrium conditions for neutron stars and baryon number and electric charge conservation. We investigate properties of both nuclear and neutron matter. Using the TOV equations, the role of the softness of quark bags degrees of freedom on bulk static properties of neutron stars are determined.
- OSTI ID:
- 20630362
- Journal Information:
- AIP Conference Proceedings, Vol. 739, Issue 1; Conference: Joint meeting on QCD and QCP: 9. hadron physics and 7. relativistic aspects of nuclear physics, Rio de Janeiro (Brazil), 28 Mar - 3 Apr 2004; Other Information: DOI: 10.1063/1.1843627; (c) 2004 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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