Dynamical properties of nuclear and stellar matter and the symmetry energy
- Centro de Fisica Computacional, Department of Physics, University of Coimbra, P-3004-516 Coimbra (Portugal)
The effects of density dependence of the symmetry energy on the collective modes and dynamical instabilities of cold and warm nuclear and stellar matter are studied in the framework of relativistic mean-field hadron models. The existence of the collective isovector and possibly an isoscalar collective mode above saturation density is discussed. It is shown that soft equations of state do not allow for a high-density isoscalar collective mode; however, if the symmetry energy is hard enough, an isovector mode will not disappear at high densities. The crust-core transition density and pressure are obtained as a function of temperature for {beta}-equilibrium matter with and without neutrino trapping. Estimations of the size of the clusters formed in the nonhomogeneous phase, as well as the corresponding growth rates and distillation effect, are made. It is shown that cluster sizes increase with temperature, that the distillation effect close to the inner edge of the crust-core transition is very sensitive to the symmetry energy, and that, within a dynamical instability calculation, the pasta phase exists in warm compact stars up to 10-12 MeV.
- OSTI ID:
- 21419468
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevC.82.025801; (c) 2010 The American Physical Society; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DENSITY
DISTILLATION
EQUATIONS OF STATE
EQUILIBRIUM
HADRONS
INSTABILITY
ISOVECTORS
MEAN-FIELD THEORY
MEV RANGE 10-100
NEUTRINOS
NUCLEAR MATTER
RELATIVISTIC RANGE
SATURATION
STARS
SYMMETRY
TEMPERATURE DEPENDENCE
TRAPPING
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
FERMIONS
LEPTONS
MASSLESS PARTICLES
MATTER
MEV RANGE
PHYSICAL PROPERTIES
SEPARATION PROCESSES
TENSORS
VECTORS