Degeneracy in the inference of phase transitions in the neutron star equation of state from gravitational wave data

Carolyn A. Raithel; Elias R. Most

Degeneracy in the inference of phase transitions in the neutron star equation of state from gravitational wave data

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arxiv 2208.04294 v2 pith:OCS5HYZ6 submitted 2022-08-08 astro-ph.HE nucl-th

Carolyn A. Raithel , Elias R. Most This is my paper

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keywords neutronstardegeneracyphasetransitionsdataequationgravitational

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Gravitational wave (GW) detections of binary neutron star inspirals will be crucial for constraining the dense matter equation of state (EoS). We demonstrate a new degeneracy in the mapping from tidal deformability data to the EoS, which occurs for models with strong phase transitions. We find that there exists a new family of EoS with phase transitions that set in at different densities and that predict neutron star radii that differ by up to ~500m, but that produce nearly identical tidal deformabilities for all neutron star masses. Next generation GW detectors and advances in nuclear theory may be needed to resolve this degeneracy.

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Crust (Unified) Tool for Equation-of-state Reconstruction (CUTER) v2
astro-ph.HE 2025-06 accept novelty 4.0 of 10

CUTER v2 reconstructs the missing or inconsistent low-density crust of arbitrary neutron-star equations of state, producing unified EoSs whose global properties match original models to within about one percent.

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