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

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JournalPhysics Letters B
DateAccepted/In press - 20 Mar 2018
DateE-pub ahead of print - 23 Mar 2018
DatePublished (current) - 10 Jun 2018
Pages (from-to)112-116
Early online date23/03/18
Original languageEnglish

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∗(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.

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© 2018, The Author(s).

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