Pseudogap of Color Superconductivity

Kitazawa, Masakiyo; Koide, T.; Kunihiro, Teiji; Nemoto, Yukio

doi:10.1143/ptps.153.301

Cited by 136 publications

(317 citation statements)

References 4 publications

Supporting

Mentioning

281

Contrasting

Order By: Relevance

“…On the other hand, various models predict that there exists a discontinuous first order phase transition at nonzero µ B . The existence of the endpoint of the first order transition, the QCD critical point [3], and possibly multiple critical points [4], are anticipated in the phase diagram of QCD on T -µ B plane [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction

Asakawa

Kitazawa

2016

Progress in Particle and Nuclear Physics

Self Cite

119

102

View full text Add to dashboard Cite

Bulk fluctuations of conserved charges measured by event-by-event analysis in relativistic heavy ion collisions are observables which are believed to carry significant amount of information on the hot medium created by the collisions. Active studies have been done recently experimentally, theoretically, and on the lattice. In particular, non-Gaussianity of the fluctuations has acquired much attention recently. In this review, we give a pedagogical introduction to these issues, and survey recent developments in this field of research. Starting from the definition of cumulants, basic concepts in fluctuation physics, such as thermal fluctuations in statistical mechanics and time evolution of fluctuations in diffusive systems, are described. Phenomena which are expected to occur in finite temperature and/or density QCD matter and their measurement by event-byevent analyses are also elucidated.

show abstract

Section: Introductionmentioning

confidence: 99%

Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction

Asakawa

Kitazawa

2016

Progress in Particle and Nuclear Physics

Self Cite

119

102

View full text Add to dashboard Cite

show abstract

“…In QCD, however, the strong attraction exists in the scaler quark-antiquark channel which leads to a non-perturbative phenomenon called the dynamical chiral condensation in the low density regime. It is interesting to investigate how the incorporation of the dynamical formation of the chiral condensates affects color superconducting phases [27,28]. The competition between the chiral and diquark condensations under the charge neutrality constraints was first investigated in a four-Fermion model [24]; it was shown that the second densest phase next to the CFL strongly depends on the quark-quark (diquark) coupling strength, and in particular, the gapless CFL phase may be washed out from the phase diagram except for an extremely weak coupling case.…”

Section: Introductionmentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Also, at finite density, a renormalization of the chemical potential by the vectorvector interaction is expected, as considered already in the earliest work [15]. The effect of the vector interaction has been discussed in the context of the QCD phase diagram [14,34,17,35,36]. A vector-vector coupling constant as small as only 10 ∼ 20% of the four-fermion coupling constant in the scalar channel is enough to make the critical point disappear from the phase diagram.…”

Section: Phase Diagrammentioning

confidence: 97%

Phase diagram from PNJL models

Fukushima¹

2010

Proceedings of 5th International Workshop on Critical Point and Onset of Deconfinement — PoS(CPOD 2009)

View full text Add to dashboard Cite

Possible phase diagrams of QCD at finite temperature and baryon chemical potential are discussed from the point of view of the effective model study especially by means of the Polyakov-loop coupled Nambu-Jona-Lasinio (PNJL) model. Two crossovers associated with quark deconfinement and chiral restoration are located at the (nearly) same temperature as long as the baryon chemical potential is small, but they eventually result in distinct boundaries on the phase diagram with increasing baryon density, which characterizes a region surrounded by two boundary curves. Also, the chiral critical point and the isentropic trajectories around it are critically argued.

show abstract

Pseudogap of Color Superconductivity

Cited by 136 publications

References 4 publications

Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction

Fluctuations of conserved charges in relativistic heavy ion collisions: An introduction

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

Phase diagram from PNJL models

Contact Info

Product

Resources

About