Reconciling multi-messenger constraints with chiral symmetry restoration

Abstract

We analyze the recent astrophysical constraints in the context of a hadronic equation of state (EoS), in which the baryonic matter is subject to chiral symmetry restoration. We show that with such EoS it is possible to reconcile the modern constraints on the neutron star (NS) mass, radius, and tidal deformability (TD). We find that the softening of the EoS, required by the TD constraint of a canonical $1.4M_{\odot }$ NS, followed by a subsequent stiffening, required by the $2M_{\odot }$ constraint, is driven by the appearance of $\Delta$ matter due to partial restoration of chiral symmetry. Consequently, a purely hadronic EoS that accounts for the fundamental properties of quantum chromodynamics linked to the dynamical emergence of parity doubling with degenerate masses of nucleons and $\Delta$ resonances can be fully consistent with multi-messenger data. Therefore, with the present constraints on the EoS, the conclusion about the existence of the quark matter in the stellar core may still be premature.

arXiv commentversion accepted for publication ApJ Letters

References in corpus (44)

• GW170817: Measurements of Neutron Star Radii and Equation of State
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• Tidal Love numbers of neutron stars
• Properties of the binary neutron star merger GW170817
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Equations of state for supernovae and compact stars
• Gravitational-wave constraints on the neutron-star-matter Equation of State
• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• Evidence for quark-matter cores in massive neutron stars
• Implications of PREX-II on the equation of state of neutron-rich matter
• Neutron skins and neutron stars in the multi-messenger era
• Generic conditions for stable hybrid stars
• Identifying a first-order phase transition in neutron star mergers through gravitational waves
• Implications from GW170817 and I-Love-Q relations for relativistic hybrid stars
• Astrophysical Constraints on the Symmetry Energy and the Neutron Skin of ${}^{208}$Pb with Minimal Modeling Assumptions
• Compact stars with sequential QCD phase transitions
• Chiral Symmetry of Baryons
• Quark deconfinement as supernova explosion engine for massive blue-supergiant stars
• Information content of the parity-violating asymmetry in ${}^{208}$Pb
• Equation of state constraints from the threshold binary mass for prompt collapse of neutron star mergers
• Competition between delta isobars and hyperons and properties of compact stars
• Cold, dense nuclear matter in a SU(2) parity doublet model
• Constraining the onset density of the hadron-quark phase transition with gravitational-wave observations
• Asymmetric nuclear matter in a parity doublet model with hidden local symmetry
• Thermodynamics of dense hadronic matter in a parity doublet model
• Nuclear Matter and Neutron stars in a Parity Doublet Model
• Hyperons in thermal QCD: A lattice view
• Neutron stars with small radii -- the role of delta resonances
• Relativistic hybrid stars in light of the NICER PSR J0740+6620 radius measurement
• An effective model for the QCD phase transitions at finite baryon density
• Chiral symmetry restoration by parity doubling and the structure of neutron stars
• Dynamical Model of Coherent Pion Production in Neutrino-Nucleus Scattering
• Quark-hadron crossover equations of state for neutron stars: constraining the chiral invariant mass in a parity doublet model
• Electron and Photon induced Reactions on Nuclei in the Nucleon Resonance Region
• Toward a unified equation of state for multi-messenger astronomy
• Constraint to chiral invariant masses of nucleons from GW170817 in an extended parity doublet model
• Parity Doubling and the Dense Matter Phase Diagram under Constraints from Multi-Messenger Astronomy
• Net-baryon number fluctuations in the Hybrid Quark-Meson-Nucleon model at finite density
• The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
• Catalysis of partial chiral symmetry restoration by Delta matter
• Speed of sound and quark confinement inside neutron stars
• Interplay between chiral dynamics and repulsive interactions

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• Neutron star matter based on a parity doublet model including the $a_0(980)$ meson
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• Fluctuations near the liquid-gas and chiral phase transitions in hadronic matter
• Fluctuations and correlations of baryonic chiral partners
• Anatomy of critical fluctuations in hadronic matter
• Conformality and percolation threshold in neutron stars
• Investigating the Impact of Higher-Order Phase Transitions in Binary Neutron-Star Mergers
• Emergent chirality and superfluidity of parity-doubled baryons in neutron stars
• A TESS View of Post-Eruption Variability in the Novae V1405 Cas,V1716 Sco, and V1674 Her
• Recurring region for neutron-star observables
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