Speaker
Yoshinobu Kuramashi
(University of Tsukuba)
Description
We present the results of the physical point simulation in 2+1 flavor lattice QCD with the nonperturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action at beta=1.9 on a 32^3x64 lattice. The physical quark masses together with the lattice spacing is determined with m_pi, m_K and m_Omega as physical inputs.
There are two key algorithmic ingredients to make possible the direct simulation at the physical point:
One is the mass-preconditioned domain-decomposed HMC algorithm to reduce the computational cost. The other is the reweighting technique to adjust the hopping parameters exactly to the physical point.
We discuss the latter in detail.
Some physics results are also presented.
