Lattice QCD at nonzero temperature and density

Aarts, G.; Allton, C.; Hands, S.; Jäger, B.; Kim, S.; Lombardo, M. P.; Nikolaev, A. A.; Ryan, S. M.; Skullerud, J. -I.

doi:10.48550/arxiv.2111.10787

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“…For this the group utilises an anisotropic lattice, although use of other methods such as NRQCD are employed also. A broad sample of the work from the FASTSUM collaboration can be found in the following references [11][12][13][14][15][16][17][18]. A long term major goal of the collaboration is to non-perturbatively compute the QCD viscosity with a good sampling over temperature.…”

Section: Motivation and Contextmentioning

confidence: 99%

High Temperature QCD Calculations Using Gradient Flow On An Anisotropic Lattice

Kirby¹

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Understanding the evolution of the universe from its earliest configuration to its present state requires an understanding of strongly coupled systems such as QCD. Many interesting components of QCD such as confinement and chiral-symmetry breaking can only be understood using first principles non-perturbative methods such as lattice field theory. The energy-momentum tensor is key within QCD thermodynamics, containing information on the equation of state and transport properties such as specific heat and viscosity. Defining the energy-momentum tensor on the lattice is challenging, however it has been made obtainable recently by using a tool known generally as gradient flow. This has been used in order to compute thermodynamic quantities on the lattice, however due to the isotropy of the involved lattices, obtaining fine temperature sampling can be difficult. This work implements the gradient flow method for obtaining thermodynamic quantities from the energymomentum tensor, by using an anisotropic lattice, which as far as the author is aware is the first example of such, and thus provides the novelty of this work. Another application is to compute the topological susceptibility, which is important for axion cosmology, and related to both the strong CP problem and dark matter, again for the first time using an anisotropic lattice for N f = 2 + 1 QCD.

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Section: Motivation and Contextmentioning

confidence: 99%

High Temperature QCD Calculations Using Gradient Flow On An Anisotropic Lattice

Kirby¹

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Lattice QCD at nonzero temperature and density

Abstract: We discuss some selected recent developments in the field of lattice QCD at nonzero temperature and density, describing in particular the transition from the hadronic gas to the quark-gluon plasma, as seen in simulations using Wilson fermions.

Cited by 1 publication

References 25 publications

High Temperature QCD Calculations Using Gradient Flow On An Anisotropic Lattice

High Temperature QCD Calculations Using Gradient Flow On An Anisotropic Lattice

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