TY - JOUR

T1 - Study of energy-momentum tensor correlation function in Nf = 2 + 1 full QCD for QGP viscosities

AU - Taniguchi, Yusuke

AU - Baba, Atsushi

AU - Suzuki, Asobu

AU - Ejiri, Shinji

AU - Kanaya, Kazuyuki

AU - Kitazawa, Masakiyo

AU - Shimojo, Takanori

AU - Suzuki, Hiroshi

AU - Umeda, Takashi

N1 - Funding Information:
This work was in part supported by JSPS KAKENHI Grant Numbers JP18K03607, JP17K05442, JP16H03982, JP15K05041, JP26400251, JP26400244, and JP26287040. This research used computational resources of COMA and Oakforest-PACS provided by the Interdisciplinary Computational Science Program of Center for Computational Sciences, University of Tsukuba, Oakforest-PACS at JCAHPC through the HPCI System Research Project (Project ID:hp17208), OCTOPUS at Cybermedia Center, Osaka University, and ITO at R.I.I.T., Kyushu University. The simulations were in part based on the Lattice QCD code set Bridge++ [18].

PY - 2018

Y1 - 2018

N2 - We study correlation functions of the energy-momentum tensor (EMT) in (2 + 1)-flavor full QCD to evaluate QGP viscosities. We adopt nonperturbatively improved Wilson fermion and Iwasaki gauge action. Our degenerate u, d quark mass is rather heavy with mπ /mρ ' 0.63, while the s quark mass is set to approximately its physical value. Performing simulations on lattices with Nt = 16 to 6 at a fine lattice spacing of a = 0.07 fm, the temperature range of T ' 174–464 MeV is covered using the fixed-scale approach. We attempt to compute viscosities by three steps: (1) calculate two point correlation functions of non-perturbatively renormalized EMT applying the gradient flow method, (2) derive the spectral function from correlation function, and (3) extract viscosities from the spectral function applying the Kubo formula. We report on the status of the project and present preliminary results for the shear viscosity in the high temperature phase.

AB - We study correlation functions of the energy-momentum tensor (EMT) in (2 + 1)-flavor full QCD to evaluate QGP viscosities. We adopt nonperturbatively improved Wilson fermion and Iwasaki gauge action. Our degenerate u, d quark mass is rather heavy with mπ /mρ ' 0.63, while the s quark mass is set to approximately its physical value. Performing simulations on lattices with Nt = 16 to 6 at a fine lattice spacing of a = 0.07 fm, the temperature range of T ' 174–464 MeV is covered using the fixed-scale approach. We attempt to compute viscosities by three steps: (1) calculate two point correlation functions of non-perturbatively renormalized EMT applying the gradient flow method, (2) derive the spectral function from correlation function, and (3) extract viscosities from the spectral function applying the Kubo formula. We report on the status of the project and present preliminary results for the shear viscosity in the high temperature phase.

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M3 - Conference article

AN - SCOPUS:85069951839

SN - 1824-8039

VL - 334

JO - Proceedings of Science

JF - Proceedings of Science

M1 - 166

T2 - 36th Annual International Symposium on Lattice Field Theory, LATTICE 2018

Y2 - 22 July 2018 through 28 July 2018

ER -