Reconciling Multi-messenger Constraints with Chiral Symmetry Restoration

Abstract

We consider the parity doublet model for nucleonic and delta matter to investigate the structure of neutron stars. We show that it is possible to reconcile the multi-messenger astronomy constraints within a purely hadronic equation of state (EOS), which accounts for the self-consistent treatment of the chiral symmetry restoration in the baryonic sector. We demonstrate that the characteristics of the EOS required by the astrophysical constraints do not necessarily imply the existence of a hadron-quark phase transition in the stellar core.

Masses of Compact (Neutron) Stars with Distinguished Cores

“…see Equation (14) below). NY∆ DD-EM2 shows a softening at p ≈ 10 MeV/fm 3 , η ≈ 0.5, caused by the onset of ∆ proliferation, similar to Ref [108]…”

“…NY∆ DD-EM2 shows a softening at p ≈ 10 MeV/fm 3 , η ≈ 0.5, caused by the onset of ∆ proliferation, similar to Ref. [108]. Right panel: Mass-radius relation for NY∆ DD-EM2 EoS of…”

Masses of compact (neutron) stars with distinguished cores

“…( 14) below). NY∆ DD-EM2 shows a softening at p ≈ 10 MeV/fm 3 , η ≈ 0.5, caused by the onset of ∆ proliferation, similar to [108]. Right panel: Mass-radius relation for NY∆ DD-EM2 EoS of [31] (solid black curve) in comparison with the parameterization by Eq.…”