Speaker
Description
Strong coupling lattice QCD provides an effective framework for studying finite density QCD and the nuclear liquid–gas transition using dual degrees of freedom such as monomers, dimers, and baryon worldlines. In this representation, the sign problem is significantly reduced, enabling direct investigations of strongly interacting matter at low temperatures and finite baryon density.
However, the low temperature regime remains numerically very expensive. The worm algorithm suffers from rapidly increasing autocorrelation times, poor tunneling between metastable states, and inefficient sampling near the first order nuclear liquid-gas transition. These limitations make it difficult to explore the deep low temperature region and reliably determine the phase structure.
In this talk, I will introduce a new sampling strategy designed to overcome these limitations. The method employs nonlocal updates while simultaneously satisfying the local constraints of the dual variables through sublattice sampling techniques, aiming to improve efficiency in regimes where worm updates become ineffective. I will discuss the basic formulation of the method in the strong-coupling dual representation and its possible application to low temperature and finite density QCD systems.