Chemical and mechanical instability in warm and dense nuclear matter

Abstract

We investigate the possible thermodynamic instability in a warm and dense nuclear medium (T<50 MeV and ρ_0<ρ_B< 3ρ_0) where a phase transition from nucleonic matter to resonance-dominated Delta-matter can take place. The analysis is performed by requiring the global conservation of baryon and electric charge numbers in the framework of a relativistic equation of state. Similarly to the liquid-gas phase transition, we show that the nucleon-Delta matter phase transition is characterized by both mechanical instability (fluctuations on the baryon density) and by chemical-diffusive instability (fluctuations on the charge concentration) in asymmetric nuclear matter. We then perform an investigation and a comparative study on the different nature of such instabilities and phase transitions.

12 pages, 15 figures

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Cited by in corpus (12)

• Can very compact and very massive neutron stars both exist?
• Non-congruence of the nuclear liquid-gas and deconfinement phase transitions
• The scenario of two families of compact stars 1. Equations of state, mass-radius relations and binary systems
• The scenario of two families of compact stars 2. Transition from hadronic to quark matter and explosive phenomena
• Catalysis of partial chiral symmetry restoration by Delta matter
• Nonextensive statistical effects and strangeness production in hot and dense nuclear matter
• Nonextensive Nuclear Liquid-Gas Phase Transition
• Hadronic freeze-out in an effective relativistic mean field model
• Neutron star matter equation of state including $d^{\ast }$-hexaquark degrees of freedom
• Critical Scaling of Two-component Systems from Quantum Fluctuations
• Non-extensive thermostatistics approach to metal melting entropy
• Strangeness thermodynamic instabilities in hot and dense nuclear matter