Thermodynamics with $N_f=2+1+1$ twisted mass quarks

Burger, Florian; Hotzel, Grit; Mueller-Preussker, M.; Ilgenfritz, E. M.; Lombardo, Maria Paola

doi:10.22323/1.187.0153

Cited by 14 publications

(14 citation statements)

References 12 publications

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“…We start our analysis of the dynamics and decoupling properties of the system with the gluon dressing. Here we also provide a further benchmark test of the present approach at vanishing baryon chemical potential: In Figure 13 we compare our results at finite T and µ B = 0 to lattice results on the magnetic gluon dressing function from [193] based on the tmfT configurations [194]; for this simulation setup see also [195,196]. Note that the lattice results are obtained for N f = 2 + 1 + 1 flavours, with β = 2.1, a = 0.0646 fm and an approximate pion mass of m π = 369(15) MeV leading to a critical temperature of T deconf = 193(13)(2) MeV.…”

Section: Dynamics and Sequential Decouplingmentioning

confidence: 97%

“…However, we emphasise again that our observation of a minimum at nonzero spatial momentum in the mesonic dispersion is a strong indication for very interesting physics in this regime. [193], based on the tmfT configurations [194], for the tmfT simulation setup see also [195,196]. The lattice results depicted here are obtained for β = 2.1, a = 0.0646 fm and an approximate pion mass of mπ = 369(15) MeV leading to a pseudocritical temperature of T deconf = 193(13)(2) MeV, for more details see [193].…”

Section: B Inhomogeneous Regime At Large Chemical Potentialmentioning

confidence: 98%

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QCD phase structure at finite temperature and density

2020

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We discuss the phase structure of QCD for N f = 2 and N f = 2 + 1 dynamical quark flavours at finite temperature and baryon chemical potential. It emerges dynamically from the underlying fundamental interactions between quarks and gluons in our work. To this end, starting from the perturbative high-energy regime, we systematically integrate-out quantum fluctuations towards low energies by using the functional renormalisation group. By dynamically hadronising the dominant interaction channels responsible for the formation of light mesons and quark condensates, we are able to extract the phase diagram for µB/T 6. We find a critical endpoint at (TCEP, µB CEP ) = (107, 635) MeV. The curvature of the phase boundary at small chemical potential is κ = 0.0142(2), computed from the renormalised light chiral condensate ∆ l,R . Furthermore, we find indications for an inhomogeneous regime in the vicinity and above the chiral transition for µB 417 MeV. Where applicable, our results are in very good agreement with the most recent lattice results. We also compare to results from other functional methods and phenomenological freeze-out data. This indicates that a consistent picture of the phase structure at finite baryon chemical potential is beginning to emerge. The systematic uncertainty of our results grows large in the density regime around the critical endpoint and we discuss necessary improvements of our current approximation towards a quantitatively precise determination of QCD phase diagram.

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Section: Dynamics and Sequential Decouplingmentioning

confidence: 97%

Section: B Inhomogeneous Regime At Large Chemical Potentialmentioning

confidence: 98%

QCD phase structure at finite temperature and density

2020

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“…The present study works with lattices that feature four dynamical quark flavors, u, d, s and c. They represent a subset of configurations, which were generated by the tmfT collaboration originally for the study of QCD thermodynamics [53] in the presence of a heavy doublet of quarks (third and fourth quark species). The dynamical quarks are implemented using so-called twisted-mass actions, which take the following form for the light sector:…”

Section: Lattice Simulations and Gauge Fixingmentioning

confidence: 99%

Finite-temperature gluon spectral functions from $$N_f=2+1+1$$ N f = 2 + 1 + 1 lattice

et al. 2018

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We investigate gluon correlation functions and spectral functions at finite temperature in Landau gauge on lattice QCD ensembles with N f = 2 + 1 + 1 dynamical twisted-mass quarks flavors, generated by the tmfT collaboration. They cover a temperature range from 0.8 ≤ T /T C ≤ 4 using the fixed-scale approach. Our study of spectral properties is based on a novel Bayesian approach for the extraction of non-positive-definite spectral functions. For each binned spatial momentum we take into account the gluon correlation functions at all available discrete imaginary frequencies. Clear indications for the existence of a well defined quasiparticle peak are obtained. Due to a relatively small number of imaginary frequencies available, we focus on the momentum and temperature dependence of the position of this spectral feature. The corresponding dispersion relation reveals different in-medium masses for longitudinal and transversal gluons at high temperatures, qualitatively consistent with weak coupling expectations.

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“…These advantages offered by the fixed-scale method yielded the first result regarding the EOS for 2 + 1 flavor QCD with nonperturbatively improved Wilson quarks [5]. Furthermore, some groups have adopted this approach to study the EOS using the smeared Wilson [6] and the twisted mass quarks [7].…”

Section: Introductionmentioning

confidence: 99%

Fixed-scale approach to finite-temperature lattice QCD with shifted boundaries

Umeda

2014

Phys. Rev. D

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We study the thermodynamics of the SU(3) gauge theory using the fixed-scale approach with shifted boundary conditions. The fixed-scale approach can reduce the numerical cost of the zerotemperature part in the equation of state calculations, while the number of possible temperatures is limited by the integer N t , which represents the temporal lattice extent. The shifted boundary conditions can overcome such a limitation while retaining the advantages of the fixed-scale approach. Therefore, our approach enables the investigation of not only the equation of state in detail, but also the calculation of the critical temperature with increased precision even with the fixed-scale approach. We also confirm numerically that the boundary conditions suppress the lattice artifact of the equation of state, which has been confirmed in the non-interacting limit. * tumeda@hiroshima-u.ac.jp

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Thermodynamics with $N_f=2+1+1$ twisted mass quarks

Cited by 14 publications

References 12 publications

QCD phase structure at finite temperature and density

QCD phase structure at finite temperature and density

Finite-temperature gluon spectral functions from $$N_f=2+1+1$$ N f = 2 + 1 + 1 lattice

Fixed-scale approach to finite-temperature lattice QCD with shifted boundaries

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