Destabilization of high-mass neutron stars by the emergence of d∗ -hexaquarks

Marcos O. Celi, Mikhail Bashkanov, Mauro Mariani, Milva G. Orsaria, Alessandro Pastore, Ignacio F. Ranea-Sandoval, Fridolin Weber

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We study the effects of the first nontrivial hexaquark, d∗(2380), on the equation of state of dense neutron star matter and investigate the consequences of its existence for neutron stars. The matter in the core regions of neutron stars is described using density-dependent relativistic mean-field theory. Our results show that within the parameter spaces examined in our paper, (i) the critical density at which the d∗ condensate emerges lies between 4 and 5 times the nuclear saturation density, (ii) d∗ hexaquarks are found to exist only in rather massive neutron stars, (iii) only relatively small fractions of the matter in the core of a massive neutron star may contain hexaquarks.

Original languageEnglish
Article number023004
Number of pages15
JournalPhysical review d
Issue number2
Publication statusPublished - 3 Jan 2024

Bibliographical note

Funding Information:
This work is supported through the U.S. National Science Foundation under Grant No. PHY-2012152 and the UK STFC (No. ST/L00478X/2, No. ST/V002570/1, ST/V001035/1). M. O. C, M. G. O, M. M and I. F. R-S. thank CONICET and UNLP for financial support under Grants No. PIP-0169 and 11/G187. I. F. R-S is partially supported by Proyecto de Investigación Científica y Tecnológica (PICT) Grant No. 2019-0366 from ANPCyT and Proyecto de Investigación Bianual para Investigadores/as Asistentes y Adjuntos (PIBAA) Grant No. 0724 from CONICET (Argentina). M. G. O. thanks Dr. W. Spinella for his valuable discussions and assistance regarding the SW4L parametrization.

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© 2024 American Physical Society.

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