Phase transitions and gluodynamics in 2-colour matter at high density

Boz, Tamer; Cotter, Seamus; Fister, Leonard; Mehta, Dhagash; Skullerud, Jon-Ivar

doi:10.1140/epja/i2013-13087-6

Cited by 54 publications

(105 citation statements)

References 120 publications

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“…In this section we extend the results presented in [4] to a wider area of the (µ, T ) plane. We have fixed our gauge configurations to the minimal Landau gauge using the standard overrelaxation algorithm.…”

Section: Gluon Propagatormentioning

confidence: 54%

“…In a series of papers [1,2,3,4] we have studied QC 2 D with 2 flavours of Wilson fermion at nonzero baryon chemical potential µ and temperature T , culminating in a tentative mapping out of the phase diagram in the (µ, T ) plane [3,4]. Here we will report on the determination of the phase transition lines [4] and present new results for the gluon propagator at nonzero µ and T .…”

Section: Introductionmentioning

confidence: 99%

“…Here we will report on the determination of the phase transition lines [4] and present new results for the gluon propagator at nonzero µ and T . Updated results for the equation of state are presented in a separate talk [5].…”

Section: Introductionmentioning

confidence: 99%

“…For the diquark source j we have used ja = 0.02, 0.04 in order to allow an extrapolation to the physical j = 0 limit. We refer to [3,4] for further details about the action and parameters. Figure 1 shows the order parameter for superfluidity, the (unrenormalised) diquark condensate qq , as a function of the temperature T , for µa = 0.35, 0.4, 0.5 and 0.6.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Phase transitions in dense 2-colour QCD

Skullerud¹,

Boz²,

Cotter³

et al. 2014

Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013)

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We investigate 2-colour QCD with 2 flavours of Wilson fermion at nonzero temperature T and quark chemical potential µ, with a pion mass of 700 MeV (m π /m ρ = 0.8). From temperature scans at fixed µ we find that the critical temperature for the superfluid to normal transition depends only very weakly on µ above the onset chemical potential, while the deconfinement crossover temperature is clearly decreasing with µ. We also present results for the Landau-gauge gluon propagator in the hot and dense medium.

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Section: Gluon Propagatormentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phase transitions in dense 2-colour QCD

Skullerud¹,

Boz²,

Cotter³

et al. 2014

Proceedings of 31st International Symposium on Lattice Field Theory LATTICE 2013 — PoS(LATTICE 2013)

Self Cite

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show abstract

“…The main activity in two-color QCD was later continued by the Swansea group (S. Hands and collaborators) for the two-flavor theory with Wilson fermions [19][20][21][22]. In a low temperature scan of the phase diagram the authors observed a hadronic phase, followed by the BCS phase with deconfinement, but did not encounter the BEC phase.…”

Section: Introductionmentioning

confidence: 99%

Phase diagram of dense two-color QCD within lattice simulations

et al. 2017

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Abstract. We present the results of a low-temperature scan of the phase diagram of dense two-color QCD with N f = 2 quarks. The study is conducted using lattice simulation with rooted staggered quarks. At small chemical potential we observe the hadronic phase, where the theory is in a confining state, chiral symmetry is broken, the baryon density is zero and there is no diquark condensate. At the critical point µ = m π /2 we observe the expected second order transition to Bose-Einstein condensation of scalar diquarks. In this phase the system is still in confinement in conjunction with nonzero baryon density, but the chiral symmetry is restored in the chiral limit. We have also found that in the first two phases the system is well described by chiral perturbation theory. For larger values of the chemical potential the system turns into another phase, where the relevant degrees of freedom are fermions residing inside the Fermi sphere, and the diquark condensation takes place on the Fermi surface. In this phase the system is still in confinement, chiral symmetry is restored and the system is very similar to the quarkyonic state predicted by S U(N c ) theory at large N c .

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Two-colour QCD phases and the topology at low temperature and high density

Iida

Itou

Lee

2020

J. High Energ. Phys.

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We delineate equilibrium phase structure and topological charge distribution of dense two-colour QCD at low temperature by using a lattice simulation with two-flavour Wilson fermions that has a chemical potential µ and a diquark source j incorporated. We systematically measure the diquark condensate, the Polyakov loop, the quark number density and the chiral condensate with improved accuracy and j → 0 extrapolation over earlier publications; the known qualitative features of the low temperature phase diagram, which is composed of the hadronic, Bose-Einstein condensed (BEC) and BCS phases, are reproduced. In addition, we newly find that around the boundary between the hadronic and BEC phases, nonzero quark number density occurs even in the hadronic phase in contrast to the prediction of the chiral perturbation theory (ChPT), while the diquark condensate approaches zero in a manner that is consistent with the ChPT prediction. At the highest µ, which is of order the inverse of the lattice spacing, all the above observables change drastically, which implies a lattice artifact. Finally, at temperature of order 0.45T c , where T c is the chiral transition temperature at zero chemical potential, the topological susceptibility is calculated from a gradient-flow method and found to be almost constant for all the values of µ ranging from the hadronic to BCS phase. This is a contrast to the case of 0.89T c in which the topological susceptibility becomes small as the hadronic phase changes into the quark-gluon plasma phase.

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Phase transitions and gluodynamics in 2-colour matter at high density

Cited by 54 publications

References 120 publications

Phase transitions in dense 2-colour QCD

Phase transitions in dense 2-colour QCD

Phase diagram of dense two-color QCD within lattice simulations

Two-colour QCD phases and the topology at low temperature and high density

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