Phase diagram of three-flavor quark matter under compact star constraints

Blaschke, D.; Fredriksson, Sverker; Grigorian, H.; Öztaş, Ahmet Mecit; Sandin, Fredrik

doi:10.1103/physrevd.72.065020

Cited by 215 publications

(267 citation statements)

References 45 publications

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“…Also we restrict the variational space by putting M = M u = M d for simplicity. This simplification does not matter in the chiral symmetry restored phase [29,30].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…There are also several thermal phase transitions. The thermally-robustest pairing phase is the 2SC and the second phase in this case is the uSC as is found in [29,30]. In the following, we shall discuss the features of these phase transitions in detail.…”

Section: A Phases For Extremely Weak Couplingmentioning

confidence: 99%

“…The formulation made above is a straightforward extension of our previous work [24] to the (T = 0) case [29,30].…”

Section: A Modelmentioning

confidence: 99%

“…It is, however, sometimes more convenient to describe the system in the (ρ B , T )-plane to have a physics intuition into the system. Also it is necessary to have the equation of state as a function of ρ B to clarify the inner structure of compact stars [30]. Here one should notice…”

Section: Baryon Density ρB At T =mentioning

confidence: 99%

“…We clarify the detailed mechanism and features of thermal phase transitions, and make clear the relations among the previous studies [22,23,29,30]. In particular, we shall study the the following.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Extensive study of phase diagram for charge-neutral homogeneous quark matter affected by dynamical chiral condensation: unified picture for thermal unpairing transitions from weak to strong coupling

2006

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We study the phase structures of charge neutral quark matter under the β-equilibrium for a wide range of the quark-quark coupling strength within a four-Fermion model. A comprehensive and unified picture for the phase transitions from weak to strong coupling is presented. We first develop a technique to deal with the gap equation and neutrality constraints without recourse to numerical derivatives, and show that the off-diagonal color densities automatically vanish with the standard assumption for the diquark condensates. The following are shown by the numerical analyses: (i) The thermally-robustest pairing phase is the two-flavor pairing (2SC) in any coupling case, while the second one for relatively low density is the up-quark pairing (uSC) phase or the color-flavor locked (CFL) phase depending on the coupling strength and the value of strange quark mass. (ii) If the diquark coupling strength is large enough, the phase diagram is much simplified and is free from the instability problems associated with imaginary Meissner masses in the gapless phases. (iii) The interplay between the chiral and diquark dynamics may bring a non-trivial first order transition even in the pairing phases at high density. We confirm (i) also by using the Ginzburg-Landau analysis expanding the pair susceptibilities up to quartic order in the strange quark mass. We obtain the analytic expression for the doubly critical density where the two lines for the second order phase transitions merge, and below which the down-quark pairing (dSC) phase is taken over by the uSC phase. Also we study how the phase transitions from fully gapped states to partially ungapped states are smeared at finite temperature by introducing the order parameters for these transitions.

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“…Also we restrict the variational space by putting M = M u = M d for simplicity. This simplification does not matter in the chiral symmetry restored phase [29,30].…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: A Phases For Extremely Weak Couplingmentioning

confidence: 99%

“…The formulation made above is a straightforward extension of our previous work [24] to the (T = 0) case [29,30].…”

Section: A Modelmentioning

confidence: 99%

Section: Baryon Density ρB At T =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Extensive study of phase diagram for charge-neutral homogeneous quark matter affected by dynamical chiral condensation: unified picture for thermal unpairing transitions from weak to strong coupling

2006

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Studying the onset of deconfinement with multi‐messenger astronomy of neutron stars

Blaschke

Cierniak

2021

Astron Nachr

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With the first multi‐messenger observation of a binary neutron star merger (GW170817), new constraints became available for masses and radii of neutron stars. We introduce a class of hybrid EoS that fulfills all these constraints and predicts a region in the mass‐radius diagram that could be populated only by hybrid neutron stars with quark matter cores. A confirmation of this conjecture would be provided when the NICER radius measurement for the high‐mass pulsar PSR J0740 + 6620 yields a radius significantly less than 11 km. Would this radius measurement yield a result in excess of 12 km, this would allow for both, a purely hadronic and a hybrid nature of this star. In the latter case, the maximum mass could reach 2.6 M⊙ so that the lighter object in the asymmetric binary merger GW190814 could have been a hybrid star. We demonstrate that this high mass can be compatible with an early onset of deconfinement for stars with masses below 1 M⊙ and the occurrence of low‐mass twin stars. In such a case, the remnant of GW170817 could be a long‐lived hypermassive pulsar.

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Hybrid neutron stars in the mass‐radius diagram

Cierniak

Blaschke

2021

Astron Nachr

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We present a systematic investigation of the possible locations for the special point (SP), a unique feature of hybrid neutron stars in the mass-radius diagram. The study is performed within the two-phase approach where the high-density (quark matter) phase is described by the constant-sound-speed (CSS) equation of state (EoS) and the nuclear matter phase around saturation density is varied from very soft (APR) to stiff (DD2 with excluded nucleon volume). Different construction schemes for the deconfinement transition are applied: Maxwell construction, mixed phase construction, and parabolic interpolation. We demonstrate for the first time that the SP is invariant not only against changing the nuclear matter EoS, but also against variation of the construction schemes for the phase transition. Since the SP serves as a proxy for the maximum mass and accessible radii of massive hybrid stars, we draw conclusions for the limiting masses and radii of hybrid neutron stars.

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Phase diagram of three-flavor quark matter under compact star constraints

Cited by 215 publications

References 45 publications

Extensive study of phase diagram for charge-neutral homogeneous quark matter affected by dynamical chiral condensation: unified picture for thermal unpairing transitions from weak to strong coupling

Extensive study of phase diagram for charge-neutral homogeneous quark matter affected by dynamical chiral condensation: unified picture for thermal unpairing transitions from weak to strong coupling

Studying the onset of deconfinement with multi‐messenger astronomy of neutron stars

Hybrid neutron stars in the mass‐radius diagram

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