XQCD 2019 (The 17th International Conference on QCD in Extreme Conditions)

Session

Session 11

26 Jun 2019, 14:45

122, 134 (Bunkyo School Building, Tokyo Campus, University of Tsukuba)

Conveners

Session 11

• Hirotsugu Fujii (U Tokyo)

38. A more powerful thimble approach to lattice field theories

Prof. Francesco Di Renzo (University of Parma & INFN)

26/06/2019, 14:45

Oral talk

Lefschetz thimbles regularisation of (lattice) field theories was put forward as a possible solution to the sign problem. Despite elegant and conceptually simple, it has many subtleties. Two major ones have to do with most relevant issues: how can one efficiently implement importance sampling on thimbles? how many thimbles should we take into account? As for the first question, since a few...

46. Improved algorithms for generalized thimble method

Prof. Andrei Alexandru (The George Washington University)

26/06/2019, 15:10

Oral talk

Questions about quantum field theories at non-zero chemical potential and/or real-time correlators are often impossible to investigate numerically due to the sign problem. A possible solution to this problem is to deform the integration domain for the path integral in the complex plane. Sampling configurations on these manifolds is challenging. In this talk I will discuss some of these...

57. The sign problem in low dimensional QCD studied by using the path optimization

Mr Yuto Mori (Kyoto University)

26/06/2019, 15:35

Oral talk

The sign problem, is a serious obstacle to perform the Monte Carlo simulations of QCD with finite chemical potential, is caused by the oscillation of the Boltzmann factor. To avoid this problem, we have proposed the path optimization method. In this method, we optimize the integral path in complex plain to decrease the cancellation in integral. In this talk, we explain the application of this...