Stellar properties indicating the presence of hyperons in neutron stars

Physical Review Research 2026 Open access

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Authors: Andreas Bauswein, Aristeidis Nikolaidis, Georgios Lioutas, Hristijan Kochankovski, Prasanta Char, C. Mondal, Micaela Oertel, Laura Tolós, N. Chamel, S. Goriely
DOI: 10.1103/ygtr-ktqk
Cited by: 5
References: 179

Abstract

We describe distinctive stellar features indicating the presence of hyperons in neutron stars as compared to purely nucleonic systems. A strongly negative curvature of the mass-radius relation R ( M ) is characteristic of hyperons, which can be determined from measurements of neutron stars with three different masses. Similarly, a reduced second derivative of the tidal deformability as a function of mass λ ( M ) points to hyperonic degrees of freedom in neutron star matter. The slopes of such curves R ( M ) and λ ( M ) can distinguish a hyperonic equation of state from purely nucleonic models if they appear increased [decreased for λ ( M ) ] relative to the maximum mass of neutron stars.

Fields of Study & Subjects

Pulsars and Gravitational Waves Research Geological and Geophysical Studies Gamma-ray bursts and supernovae

Publication details

Journal / source
Physical Review Research
Publisher
American Physical Society (APS)
Volume
8
Issue
1
Publication date
26 January 2026
Language
EN