The $d^{\ast }(2380)$ in neutron stars - a new degree of freedom?

Abstract

Elucidating the appropriate microscopic degrees of freedom within neutron stars remains an open question which impacts nuclear physics, particle physics and astrophysics. The recent discovery of the first non-trivial dibaryon, the $d^{\ast }(2380)$, provides a new candidate for an exotic degree of freedom in the nuclear equation of state at high matter densities. In this paper a first calculation of the role of the $d^{\ast }(2380)$ in neutron stars is performed, based on a relativistic mean field description of the nucleonic degrees of freedom supplemented by a free boson gas of $d^{\ast }(2380)$. The calculations indicate that the $d^{\ast }(2380)$ would appear at densities around three times normal nuclear matter saturation density, influencing the upper mass limit for a stable neutron star and the neutron and proton fractions. New possibilities for neutron star cooling mechanisms arising from the $d^{\ast }(2380)$ are also predicted.

Included comparisons with LIGO data. Included the Delta contributions

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• Impact of statistical uncertainties on the composition of the outer crust of a neutron star
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• How accurately can the Extended Thomas-Fermi method describe the inner crust of a neutron star?
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• Impact of error analysis on the composition the outer crust of a neutron star
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• On the Destabilization of High-Mass Neutron Stars by the Emergence of $d^{\ast }$-Hexaquarks
• Properties of H particle-admixed compact star