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X-ORIGINAL-URL:https://iqus.uw.edu/
X-WR-CALNAME:IQuS
X-WR-CALDESC:InQubator for Quantum Simulation
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BEGIN:VEVENT
CLASS:PUBLIC
UID:MEC-60243f9b1ac2dba11ff8131c8f4431e0@iqus.uw.edu
DTSTART:20241023T203000Z
DTEND:20241023T213000Z
DTSTAMP:20241021T113800Z
CREATED:20241021
LAST-MODIFIED:20241031
PRIORITY:5
SEQUENCE:16
TRANSP:OPAQUE
SUMMARY:Classical and quantum computing of shear viscosity for 2+1D SU(2) gauge theory
DESCRIPTION:\nXiaojun Yao, IQuS, University of Washington\nRelativistic hydrodynamics has been used to study collective behavior of light particles produced in heavy ion collisions. It has been shown that hydrodynamic calculations with a small shear viscosity give results that agree well with experimental data. Furthermore, a holographic calculation showed that the ratio of shear viscosity and entropy density is as small as 1/(4 pi) for strongly coupled N=4 supersymmetric Yang-Mills theory, which is consistent with the value extracted from experimental data via hydrodynamic simulations. On the other hand, calculating shear viscosity in QCD is very challenging: Perturbative calculations are not applicable in the temperature range of interest and Euclidean lattice QCD calculations have uncontrolled systematic uncertainties caused by the ill-defined spectral reconstruction problem. In this talk, I will discuss the Hamiltonian lattice approach that enables real-time calculations. I will take the 2+1D SU(2) pure gauge theory as an example and show some preliminary results obtained on a small lattice. The calculations take into account the running coupling and find the ratio of shear viscosity and entropy density is consistent with 1/(4 pi). Finally, I will discuss a quantum algorithm to calculate the shear viscosity, which may help us to perform calculations on larger lattices and achieve the physical limit.\n\n
URL:https://iqus.uw.edu/events/xiaojunyao_23oct2024/
CATEGORIES:Seminars
LOCATION:INT
ATTACH;FMTTYPE=image/jpeg:https://iqus.uw.edu/wp-content/uploads/2022/10/xiaojunyao.jpg
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