The effect of the energy functional on the pasta-phase properties of catalysed neutron stars

Nuclear pasta, that is an inhomogeneous distribution of nuclear matter characterised by non-spherical clustered structures, is expected to occur in a narrow spatial region at the bottom of the inner crust of neutron stars, but the width of the pasta layer is strongly model dependent. In the framewor...

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Bibliographic Details
Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2021-10, Vol.57 (10), Article 296
Main Authors: Dinh Thi, H., Fantina, A. F., Gulminelli, F.
Format: Article
Language:English
Subjects:
Bayesian analysis
Chiral dynamics
CompOSE: a repository for Neutron Star Equations of State and Transport Properties
Compressibility
Empirical analysis
Hadrons
Heavy Ions
Mathematical models
Neutron stars
Neutrons
Nuclear Fusion
Nuclear matter
Nuclear Physics
Nuclear Theory
Parameters
Particle and Nuclear Physics
Pasta
Perturbation theory
Physics
Physics and Astronomy
Regular Article
Statistical inference
Surface tension
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Summary:Nuclear pasta, that is an inhomogeneous distribution of nuclear matter characterised by non-spherical clustered structures, is expected to occur in a narrow spatial region at the bottom of the inner crust of neutron stars, but the width of the pasta layer is strongly model dependent. In the framework of a compressible liquid-drop model, we use Bayesian inference to analyse the constraints on the sub-saturation energy functional and surface tension imposed by both ab-initio chiral perturbation theory calculations and experimental measurements of nuclear masses. The posterior models are used to obtain general predictions for the crust-pasta and pasta-core transition with controlled uncertainties. A correlation study allows us to extract the most influential parameters for the calculation of the pasta phases. The important role of high-order empirical parameters and of the surface tension is underlined.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/s10050-021-00605-6