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Phase diagram of neutron-rich nuclear matter and its impact on astrophysics
Gulminelli F., Raduta A., Margueron J., Papakonstantinou P., Oertel M.
Dans Journal of Physics: Conference Series - 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio (Texas) : États-Unis (2012) - http://hal.in2p3.fr/in2p3-00762455
Physique/Physique Nucléaire Théorique
Phase diagram of neutron-rich nuclear matter and its impact on astrophysics
F. Gulminelli1, Ad.R. Raduta, J. Margueron2, P. Papakonstantinou2, M. Oertel3
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
CNRS : UMR6534 – IN2P3 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen
ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex
2 :  IPNO - Institut de Physique Nucléaire d'Orsay
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
3 :  LUTH - Laboratoire Univers et Théories
CNRS : UMR8102 – INSU – Observatoire de Paris – Université Paris VII - Paris Diderot
5 place Jules Janssen 92195 Meudon cedex
Physique théorique
Dense matter as it can be found in core-collapse supernovae and neutron stars is expected to exhibit different phase transitions which impact the matter composition and equation of state, with important consequences on the dynamics of core-collapse supernova explosion and on the structure of neutron stars. In this paper we will address the specific phenomenology of two of such transitions, namely the crust-core solid-liquid transition at sub-saturation density, and the possible strange transition at super-saturation density in the presence of hyperonic degrees of freedom. Concerning the neutron star crust-core phase transition at zero and finite temperature, it will be shown that, as a consequence of the presence of long-range Coulomb interactions, the equivalence of statistical ensembles is violated and a clusterized phase is expected which is not accessible in the grand-canonical ensemble. A specific quasi-particle model will be introduced to illustrate this anomalous thermodynamics and some quantitative results relevant for the supernova dynamics will be shown. The opening of hyperonic degrees of freedom at higher densities corresponding to the neutron stars core modifies the equation of state. The general characteristics and order of phase transitions in this regime will be analyzed in the framework of a self-consistent mean-field approach.

Communications avec actes
Journal of Physics: Conference Series
non spécifiée

11th International Conference on Nucleus-Nucleus Collisions (NN2012)
San Antonio (Texas)

21.65.-f Nuclear matter ; 97.60.Jd Neutron stars ; 95.30.Cq Elementary particle processes ; 97.60.Bw Supernovae ; 24.10.Pa Thermal and statistical models ; 26.50.+x Nuclear physics aspects of novae, supernovae, and other explosive environments
Invited Talk given at the 11th International Conference on Nucleus-Nucleus Collisions (NN2012), San Antonio, Texas, USA, May 27-June 1, 2012. To appear in the NN2012 Proceedings in Journal of Physics: Conference Series (JPCS)
Nuclear physics – Particle physics and field theory – Astrophysics and astroparticles
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