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Quantifying the uncertainties on spinodal instability in stellar matter through meta-modeling
- Source :
- J.Phys.G, J.Phys.G, 2019, 46 (6), pp.065109. ⟨10.1088/1361-6471/ab1a51⟩
- Publication Year :
- 2019
-
Abstract
- The influence of the uncertainties of the equation of state empirical parameters on the neutron stars crust-core phase transition is explored within a meta-modeling approach, in which the energy per particle is expanded as a Taylor series in density and asymmetry around the saturation point. The phase transition point is estimated from the intersection of the spinodal instability region for dynamical fluctuations with the chemical equilibrium curve. Special attention is paid to the inclusion of high-order parameters of the Taylor series and their influence on the transition point. An uncorrelated prior distribution is considered for the empirical parameters, with bulk properties constrained through effective field theory predictions, while the surface parameters are controlled from a fit of nuclear masses using the extended Thomas Fermi approximation. The results show that the isovector compressibility $K_{sym}$ and skewness $Q_{sym}$ have the most significant correlations with the transition point, along with the previously observed influence of the $L_{sym}$ parameter. The estimated density and pressure of the crust-core transition are $n_t = (0.071 \pm 0.011) fm^{-3}$ and $P_t = (0.294 \pm 0.102) MeV fm^{-3}$.<br />11 pages, 7 figures
- Subjects :
- High Energy Astrophysical Phenomena (astro-ph.HE)
Physics
Nuclear and High Energy Physics
Spinodal
Bayesian methods
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Nuclear Theory
010308 nuclear & particles physics
Bayesian probability
FOS: Physical sciences
crust-core phase transition
01 natural sciences
7. Clean energy
Instability
meta-modeling
neutron stars
Nuclear Theory (nucl-th)
Neutron star
dynamical spinodal
0103 physical sciences
Statistical physics
010306 general physics
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics - High Energy Astrophysical Phenomena
Nuclear theory
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- J.Phys.G, J.Phys.G, 2019, 46 (6), pp.065109. ⟨10.1088/1361-6471/ab1a51⟩
- Accession number :
- edsair.doi.dedup.....3a8e67f7aac7124b9de237bad3ca543e