The equation of state for dense nuclear matter in $\beta$ equilibrium is explored including the possibility of a doubly strange H particle. Consistent with experimental constraints, the mass of the H in free space is taken to be near the $\mathrm{\Lambda }\mathrm{\Lambda }$ threshold. Within the quark-meson coupling model, which we use, no new parameters are required to describe the interaction between the H dibaryon and the other baryons. Compared with the case where only octet baryons are included, the maximum mass is only slightly reduced and the tidal deformability is essentially unchanged with this addition. In heavy neutron stars the H is abundant and extends nearly 6 km from the center of the star.

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• Equations of state of nuclear matter
• Nuclear astrophysics
• Nuclear matter in neutron stars
• Exotic baryons