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High statistics lattice study of stress tensor correlators in pure <math><mi>S</mi><mi>U</mi><mo>(</mo><mn>3</mn><mo>)</mo></math> gauge theory
https://repo.scoap3.org/record/27049
We compute the Euclidean correlators of the stress tensor in pure SU(3) Yang-Mills theory at finite temperature at zero and finite spatial momenta with lattice simulations. We perform continuum extrapolations using Nτ=10, 12, 16, 20 lattices with renormalized anisotropy 2. We use these correlators to estimate the shear viscosity of the gluon plasma in the deconfined phase. For T=1.5Tc, we estimate η/s=0.17(2) using an ansatz motivated by hydrodynamics.Borsányi, Sz.Fri, 27 Jul 2018 20:16:15 GMThttps://repo.scoap3.org/record/27049urn:ISSN:2470-0029APS2018-07-27Hadronic Vacuum Polarization Contribution to the Anomalous Magnetic Moments of Leptons from First Principles
https://repo.scoap3.org/record/26790
We compute the leading, strong-interaction contribution to the anomalous magnetic moment of the electron, muon, and tau using lattice quantum chromodynamics (QCD) simulations. Calculations include the effects of u, d, s, and c quarks and are performed directly at the physical values of the quark masses and in volumes of linear extent larger than 6 fm. All connected and disconnected Wick contractions are calculated. Continuum limits are carried out using six lattice spacings. We obtain aeLO−HVP=189.3(2.6)(5.6)×10−14, aμLO−HVP=711.1(7.5)(17.4)×10−10 and aτLO−HVP=341.0(0.8)(3.2)×10−8, where the first error is statistical and the second is systematic.Borsanyi, Sz.Fri, 13 Jul 2018 00:16:35 GMThttps://repo.scoap3.org/record/26790urn:ISSN:1079-7114APS2018-07-12Axion cosmology, lattice QCD and the dilute instanton gas
https://repo.scoap3.org/record/12605
Axions are one of the most attractive dark matter candidates. The evolution of their number density in the early universe can be determined by calculating the topological susceptibility χ(T) of QCD as a function of the temperature. Lattice QCD provides an ab initio technique to carry out such a calculation. A full result needs two ingredients: physical quark masses and a controlled continuum extrapolation from non-vanishing to zero lattice spacings. We determine χ(T) in the quenched framework (infinitely large quark masses) and extrapolate its values to the continuum limit. The results are compared with the prediction of the dilute instanton gas approximation (DIGA). A nice agreement is found for the temperature dependence, whereas the overall normalization of the DIGA result still differs from the non-perturbative continuum extrapolated lattice results by a factor of order ten. We discuss the consequences of our findings for the prediction of the amount of axion dark matter.Borsanyi, Sz.Wed, 11 Nov 2015 18:07:55 GMThttps://repo.scoap3.org/record/12605urn:ISSN:0370-2693Elsevier2017-03-23