Updates on the Columbia plot and its extended/alternative versions

Cuteri, Francesca; Czaban, Christopher; Philipsen, Owe; Sciarra, Alessandro

doi:10.1051/epjconf/201817507032

Cited by 16 publications

(14 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

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“…We fitted our values of T χ for the two scenarios that have been under discussion in the context of the order of the phase transition in the chiral limit of the two-flavour theory [2,4]. First, we confirm that for these largish masses we cannot discriminate between different critical scenario.…”

Section: From T χ Disc ψψsupporting

confidence: 57%

“…As a consequence of this, fundamental degrees of freedom manifest their influence in a sequential way when temperature increases: particles of the light spectrum dissolve first, heavy bound states later. Among the quarks themselves, the light ones, which receive most of their masses at the quark-gluon transition, have a significant influence on the transition itself: the dependence of the value of the pseudocritical temperature(s) as well as of the nature of the transition on the masses of light current quark masses, as well as the role of the strange quark mass around T c have been studied at a great length, and the current status of our understanding of the sensitivity of the phase diagram to the light degrees of freedom is for instance summarized in the so-called Columbia plot [2][3][4]. Closely related with the issue of nature of the phase transition is the (effective) restoration of the U A (1) symmetry [5,6].…”

Section: Introductionmentioning

confidence: 99%

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Chiral observables and topology in hot QCD with two families of quarks

et al. 2018

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We present results on QCD with four dynamical flavors in the temperature range 150 MeV T 500 MeV. We have performed lattice simulations with Wilson fermions at maximal twist and measured Polyakov loop, chiral condensate and disconnected susceptibility, on lattices with spacings as fine as 0.065 fm. For most observables spacing effects are below statistical errors, which enables us to identify lattice results with continuum estimates. Our estimate of the pseudocritical temperature compares favorably with continuum results from staggered and domain wall fermions, confirming that a dynamical charm does not contribute in the transition region. From the high temperature behaviour of the disconnected chiral susceptibility we infer the topological susceptibility, which encodes relevant properties of the QCD axion, a plausible Dark Matter candidate. The topological susceptibility thus measured exhibits a power-law decay for T /Tc 2, with an exponent close to the one predicted by the Dilute Instanton Gas Approximation (DIGA). Close to Tc the temperature dependent effective exponent seems to approach the DIGA result from above, a behaviour which would support recent analytic calculations based on an Instantons-dyons model. These results constrain the mass of a hypothetic QCD post-inflationary axion, once an assumption concerning the relative contribution of axions to Dark Matter is made.

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Section: From T χ Disc ψψsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Chiral observables and topology in hot QCD with two families of quarks

et al. 2018

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“…However, so far, the continuum limit of the critical mass has not been conclusively determined. Another first-order transition region is located around the heavy quark limit [21][22][23][24][25][26][27]: when all the quarks are infinitely heavy, QCD is just the pure gauge SU(3) Yang-Mills theory (quenched QCD), which is known to have a weakly first-order deconfinement transition [28]. This first-order transition changes to crossover when the quark mass becomes smaller than a critical value.…”

Section: Introductionmentioning

confidence: 99%

End point of the first-order phase transition of QCD in the heavy quark region by reweighting from quenched QCD

et al. 2020

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We study the end point of the first-order deconfinement phase transition in two and 2+1 flavor QCD in the heavy quark region of the quark mass parameter space. We determine the location of critical point at which the first-order deconfinement phase transition changes to crossover, and calculate the pseudo-scalar meson mass at the critical point. Performing quenched QCD simulations on lattices with the temporal extents N t = 6 and 8, the effects of heavy quarks are determined using the reweighting method. We adopt the hopping parameter expansion to evaluate the quark determinants in the reweighting factor. We estimate the truncation error of the hopping parameter expansion by comparing the results of leading and next-toleading order calculations, and study the lattice spacing dependence as well as the spatial volume dependence of the result for the critical point. The overlap problem of the reweighting method is also examined. Our results for N t = 4 and 6 suggest that the critical quark mass decreases as the lattice spacing decreases and increases as the spatial volume increases.

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“…However, 2+1 flavor QCD with physical quark masses does not provide a first-order phase transition. Insofar, the present set-up is more appropriate for 2+1 flavor QCD in the chiral limit, which in fact enjoys a first-order phase transition [68], but detailed information on n of the first three states (color code as in Fig. 8) as a function of the temperature for the parameter p = 2 (solid) and p = 1 (dashed).…”

Section: Requiring a Minimum Of U 0 (Z)mentioning

confidence: 99%

“…1 The Columbia plot (cf. [68] for an updated version) provides several options for 2+1 flavor QCD: in dependence on the quark masses, first-and secondorder phase transitions may show up as well as a cross-over and some others. We try to answer the question which properties the dilaton potential must have to enable these phase properties related to deconfinement and chiral restoration in QCD.…”

Section: Introductionmentioning

confidence: 99%

Phase structures emerging from holography with Einstein-gravity-dilaton models at finite temperature

Zöllner

Kämpfer

2020

Eur. Phys. J. Plus

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Asymptotic AdS Riemann space-times in five dimensions with a black brane (horizon) sourced by a fully back-reacted scalar field (dilaton) offer -via the holographic dictionary -various options for the thermodynamics of the flat four-dimensional boundary theory, uncovering Hawking-Page, first-order and second-order phase transitions up to a cross-over or featureless behavior. The relation of these phase structures to the dilaton potential is clarified and illustrating examples are presented. Having in mind applications to QCD we study vector mesons in the probe limit with the goal to figure out conditions for forming Regge type series of radial excitations and address the issue of meson melting.

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Updates on the Columbia plot and its extended/alternative versions

Cited by 16 publications

References 11 publications

Chiral observables and topology in hot QCD with two families of quarks

Chiral observables and topology in hot QCD with two families of quarks

End point of the first-order phase transition of QCD in the heavy quark region by reweighting from quenched QCD

Phase structures emerging from holography with Einstein-gravity-dilaton models at finite temperature

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