The d*(2380) in neutron stars - a new degree of freedom?

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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∗(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∗(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∗(2380). The calculations
indicate that the d∗(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∗(2380)are also predicted.
Original languageEnglish
Pages (from-to)112-116
Number of pages5
JournalPhysics Letters B
Early online date23 Mar 2018
Publication statusPublished - 10 Jun 2018

Bibliographical note

© 2018, The Author(s).


  • EoS
  • Hexaquarks
  • Neutron stars

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