Simultaneous chiral symmetry restoration and deconfinement - Consequences for the QCD phase diagram

Abstract

For studies of quark matter in astrophysical scenarios the thermodynamic bag model (tdBag) is commonly employed. Although successful, it does not account for dynamical chiral symmetry breaking (D$\chi$SB) and repulsions due to the vector interaction which is crucial to explain recent observations of massive, two solar mass neutron stars. In Klähn & Fischer (2015) we developed the novel vBag quark matter model which takes these effects into account. This article extends vBag to finite temperatures and isospin asymmetry. Another particular feature of vBag is the determination of the deconfinement bag constant $B_{\mathrm{dc}}$ from a given hadronic equation of state (EoS) in order to ensure that chiral and deconfinement transitions coincide. We discuss consequences of this novel approach for the phase transition construction, the phase diagram, and implications for protoneutron stars.

12 pages, 10 figures, published in The Astrophysical Journal, Vol. 836, 89 (2017)

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• On the nature of the mass-gap object in the GW190814 event
• Modified MIT Bag Models -- part II: QCD phase diagram and hot quark stars
• The state of matter in simulations of core-collapse supernovae -- Reflections and recent developments
• Towards a Unified Quark-Hadron Matter Equation of State for Applications in Astrophysics and Heavy-Ion Collisions
• Universal relations for rapidly rotating cold and hot hybrid star
• Toward a unified equation of state for multi-messenger astronomy
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• Exploring thermal effects of the hadron-quark matter transition in neutron star mergers
• QCD phase transition drives supernova explosion of a very massive star
• Vector-Interaction-Enhanced Bag Model
• Compactness in the Thermal Evolution of Twin Stars
• Hybrid stars with large quark cores within the parity doublet model and modified NJL model
• New algorithm to study the pseudo-Wigner solution of the quark gap equation in the framework of the (2+1)-flavor NJL model
• Second look to the Polyakov Loop Nambu-Jona-Lasinio model at finite baryonic density
• Impact of the Nuclear Equation of State on the Stability of Hybrid Neutron Stars
• Constraining the onset density for the QCD phase transition with the neutrino signal from core-collapse supernovae
• QCD Phase Diagrams via QHD and MIT-Based Models
• Lifting the Veil on Quark Matter in Compact Stars with Core g-mode Oscillations
• Constraining the competition between the deconfinement and chiral phase transitions in light of the multimessenger era
• Influence of light quark loops on the Wigner phase with Dyson-Schwinger equations approach
• Exploring the In-Medium Momentum Dependence of the Dynamical Quark Mass
• Prospects for compact hexaquarks under the limitation imposed by quark confinement