We investigate the physical properties of the protoneutron stars in the framework of a relativistic mean-field model and we study the finite-temperature equation of state in β-stable matter at fixed entropy per baryon, in the presence of hyperons, ∆-isobar resonances and trapped neutrinos. In this context, we study the possible presence of thermodynamic instabilities and a phase transition from nucleonic matter to resonance-dominated ∆-matter can take place. Such a phase transition is characterized by both mechanical instability (fluctuations on the baryon density) and by chemical-diffusive instability (fluctuations on the isospin concentration) in asymmetric nuclear matter. We show that such statistical effects could play a crucial role in the structure and in the evolution of the protoneutron stars.

Thermodynamic instabilities and statistical effects in protoneutron stars

Gervino, G.;
2017-01-01

Abstract

We investigate the physical properties of the protoneutron stars in the framework of a relativistic mean-field model and we study the finite-temperature equation of state in β-stable matter at fixed entropy per baryon, in the presence of hyperons, ∆-isobar resonances and trapped neutrinos. In this context, we study the possible presence of thermodynamic instabilities and a phase transition from nucleonic matter to resonance-dominated ∆-matter can take place. Such a phase transition is characterized by both mechanical instability (fluctuations on the baryon density) and by chemical-diffusive instability (fluctuations on the isospin concentration) in asymmetric nuclear matter. We show that such statistical effects could play a crucial role in the structure and in the evolution of the protoneutron stars.
2017
8th International Workshop on Decoherence, Information, Complexity and Entropy, DICE 2016
Castello Pasquini, ita
2016
880
1
1
7
http://www.iop.org/EJ/journal/conf
Physics and Astronomy (all)
Gervino, Gianpiero; Lavagno, A.; Pigato, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1651533
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