Phase diagram of chirally imbalanced QCD matter

Chernodub, M. N.; Nedelin, Anton

doi:10.1103/physrevd.83.105008

Cited by 83 publications

(111 citation statements)

References 38 publications

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“…[21], µ c 5 = 50 MeV in ref. [22]) -the transition from the hadronic to the plasma phase turns into a first order transition. In our simulations we see that the transition becomes sharper as we increase µ 5 , but we don't see a first order phase transition up to µ 5 ≈ 3.3 GeV, which would manifest itself as discontinuity in the Polyakov loop and chiral condensate at a sufficiently large spatial extension of the lattice.…”

Section: Discussionmentioning

confidence: 99%

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Two-color QCD with non-zero chiral chemical potential

Брагута

Goy

Ilgenfritz

et al. 2015

J. High Energ. Phys.

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The phase diagram of two-color QCD with non-zero chiral chemical potential is studied by means of lattice simulation. We focus on the influence of a chiral chemical potential on the confinement/deconfinement phase transition and the breaking/restoration of chiral symmetry. The simulation is carried out with dynamical staggered fermions without rooting. The dependences of the Polyakov loop, the chiral condensate and the corresponding susceptibilities on the chiral chemical potential and the temperature are presented. The critical temperature is observed to increase with increasing chiral chemical potential.

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Section: Discussionmentioning

confidence: 99%

“…frozen) by a non-zero chiral chemical potential. In this setting, the modification of the phase diagram by the chiral chemical potential µ 5 has been studied mainly by means of effective models [21][22][23][24][25][26][27], the predictions of which will later be compared with our results.…”

Section: Jhep06(2015)094mentioning

confidence: 99%

Two-color QCD with non-zero chiral chemical potential

Брагута

Goy

Ilgenfritz

et al. 2015

J. High Energ. Phys.

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“…The argument was supported therein by results obtained using a PNJL model. Notably, a CEP 5 is also located in other models with similar qualitative features [30][31][32] and µ 5 > 0 was typically found to decrease the tem-perature associated with chiral symmetry restoration: T χ µ5>0 < T χ µ5=0 . Taking this suggestion seriously, lattice simulations were performed at µ 5 = 0, with a surprising outcome, viz.…”

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confidence: 94%

Critical end point in the presence of a chiral chemical potential

Cui

Cloët

et al. 2016

Phys. Rev. D

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A class of Polyakov-loop-modified Nambu-Jona-Lasinio (PNJL) models have been used to support a conjecture that numerical simulations of lattice-regularized quantum chromodynamics (QCD) defined with a chiral chemical potential can provide information about the existence and location of a critical endpoint in the QCD phase diagram drawn in the plane spanned by baryon chemical potential and temperature. That conjecture is challenged by conflicts between the model results and analyses of the same problem using simulations of lattice-regularized QCD (lQCD) and wellconstrained Dyson-Schwinger equation (DSE) studies. We find the conflict is resolved in favor of the lQCD and DSE predictions when both a physically-motivated regularization is employed to suppress the contribution of high-momentum quark modes in the definition of the effective potential connected with the PNJL models and the four-fermion coupling in those models does not react strongly to changes in the mean-field that is assumed to mock-up Polyakov loop dynamics. With the lQCD and DSE predictions thus confirmed, it seems unlikely that simulations of lQCD with µ5 > 0 can shed any light on a critical endpoint in the regular QCD phase diagram.PACS numbers: 12.38. Mh, 25.75.Nq, 12.38.Aw I. Introduction. One of the most basic questions in the Standard Model refers to unfolding the state of stronglyinteracting matter at extreme temperature and density: the former existed shortly after the Big-Bang and the latter is thought to exist in the core of compact astrophysical objects. Quantum chromodynamics (QCD) is supposed to provide the answer, which hinges on the existence and interplay between color confinement and dynamical chiral symmetry breaking (DCSB), two emergent phenomena whose domains of persistence and disappearance characterize a potentially very rich phase structure. Confinement is most simply defined empirically: those degrees-of-freedom used in defining the QCD Lagrangian (gluons and quarks) do not exist as asymptotic states, i.e. these partonic excitations do not propagate with integrity over length-scales that exceed some modest fraction of the proton's radius. The forces responsible for confinement appear to generate more than 98% of the mass of visible matter [1,2]. This is DCSB, a quantum field theoretical effect that is expressed and explained via, inter alia, the appearance of momentum-dependent massfunctions for quarks [3][4][5][6] and gluons [7][8][9][10][11][12], and helicityflipping terms in quark-gauge-boson vertices [13][14][15][16][17][18], all in the absence of any Higgs-like mechanism.Owing to the complexity of strong interaction theory, attempts are often made to develop insights concerning confinement, DCSB, and the associated phase diagram in

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“…In this case, it has been argued that the nontrivial topological structure of thermal QCD, namely the excitation of the strong sphalerons [103], locally changes the chirality of quarks; this is reflected to eventby-event charge separation, a phenomenon which is dubbed Chiral Magnetic Effect (CME) [39,41,42]. The possibility that the CME is observed in heavy ion collision experiments has motivated the study of strong interactions in presence of a chirality imbalance and a magnetic background, see [42,104,105,106,107,108] and references therein. An experimental measurement of observables connected to charge separation has been reported by the ALICE collaboration in [109].…”

Section: Introductionmentioning

confidence: 99%

Quark Matter in a Strong Magnetic Background

Gatto

Ruggieri

2013

Strongly Interacting Matter in Magnetic Fields

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In this chapter, we discuss several aspects of the theory of strong interactions in presence of a strong magnetic background. In particular, we summarize our results on the effect of the magnetic background on chiral symmetry restoration and deconfinement at finite temperature. Moreover, we compute the magnetic susceptibility of the chiral condensate and the quark polarization at zero temperature. Our theoretical framework is given by chiral models: the Nambu-Jona-Lasinio (NJL), the Polyakov improved NJL (or PNJL) and the Quark-Meson (QM) models. We also compare our results with the ones obtained by other groups.

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Phase diagram of chirally imbalanced QCD matter

Cited by 83 publications

References 38 publications

Two-color QCD with non-zero chiral chemical potential

Two-color QCD with non-zero chiral chemical potential

Critical end point in the presence of a chiral chemical potential

Quark Matter in a Strong Magnetic Background

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