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arXiv · 2602.11809

Impact of crust-core connection procedures on the tidal deformability of neutron stars

Junbo Pang·Hong Shen·Jinniu Hu
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Abstract

We study the impact of crust-core connection procedures on various neutron-star properties, especially on the tidal deformability. We consider three types of connection procedures to treat the discontinuity in a nonunified equation of state around the crust-core transition: (1) the direct connection procedure, (2) the crossover connection procedure, and (3) the segmented method. Our results indicate that the mass-radius relations of neutron stars are almost unaffected by the details of the connection procedure. However, the tidal deformabilities of neutron stars are sensitive to the crust-core connection procedures. The tidal deformability is closely related to gravitational-wave measurements. For a canonical 1.4$M_\odot$ neutron star, uncertainties in the tidal deformability $\Lambda_{1.4}$ from different connection procedures can exceed 20\%. We find that the direct connection procedure yields significantly larger uncertainties in the tidal deformability, while the segmented method and crossover connection procedure provide relatively stable results.

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Junbo Pang, Hong Shen, Jinniu Hu. 2026-02-12. Impact of crust-core connection procedures on the tidal deformability of neutron stars. https://doi.org/10.1103/jlfv-mkbt

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