We investigate the possible thermodynamic instability in a warm and dense nuclear medium (T<50 MeV and ρ0< ρB<3 ρ0) where a phase transition from nucleonic matter to resonance-dominated 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- 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.
Chemical and mechanical instability in warm and dense nuclear matter / Lavagno, Andrea; Pigato, Daniele. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - STAMPA. - 86:(2012), pp. 024917-1-024917-11. [10.1103/PhysRevC.86.024917]
Chemical and mechanical instability in warm and dense nuclear matter
LAVAGNO, Andrea;PIGATO, DANIELE
2012
Abstract
We investigate the possible thermodynamic instability in a warm and dense nuclear medium (T<50 MeV and ρ0< ρB<3 ρ0) where a phase transition from nucleonic matter to resonance-dominated 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- 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.Pubblicazioni consigliate
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https://hdl.handle.net/11583/2502564
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