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Strangeness-driven phase transition in star matter

Abstract : The phase diagram of a system constituted of neutrons, protons, $\Lambda$-hyperons and electrons is evaluated in the mean-field approximation in the complete three-dimensional space given by the baryon, lepton and strange charge. It is shown that the phase diagram at sub-saturation densities is strongly affected by the electromagnetic interaction, while it is almost independent of the electric charge at supra-saturation density. As a consequence, stellar matter under the condition of strangeness equilibrium is expected to experience a first as well as a second-order strangeness-driven phase transition at high density, while the liquid-gas phase transition is expected to be quenched. An RPA calculation indicates that the presence of this critical point might have sizable implications for the neutrino propagation in core-collapse supernovae.
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http://hal.in2p3.fr/in2p3-00776595
Contributor : Sophie Heurteau <>
Submitted on : Tuesday, January 15, 2013 - 5:34:11 PM
Last modification on : Wednesday, September 23, 2020 - 4:36:58 AM

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F. Gulminelli, Ad.R. Raduta, M. Oertel, J. Margueron. Strangeness-driven phase transition in star matter. Physical Review C, American Physical Society, 2013, 87, pp.055809. ⟨10.1103/PhysRevC.87.055809⟩. ⟨in2p3-00776595⟩

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