Journal of High Energy Physics (Aug 2024)

Full QCD with milder topological freezing

  • Claudio Bonanno,
  • Giuseppe Clemente,
  • Massimo D’Elia,
  • Lorenzo Maio,
  • Luca Parente

DOI
https://doi.org/10.1007/JHEP08(2024)236
Journal volume & issue
Vol. 2024, no. 8
pp. 1 – 26

Abstract

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Abstract We simulate N f = 2 + 1 QCD at the physical point combining open and periodic boundary conditions in a parallel tempering framework, following the original proposal by M. Hasenbusch for 2d CP N−1 models, which has been recently implemented and widely employed in 4d SU(N) pure Yang-Mills theories too. We show that using this algorithm it is possible to achieve a sizable reduction of the auto-correlation time of the topological charge in dynamical fermions simulations both at zero and finite temperature, allowing to avoid topology freezing down to lattice spacings as fine as a ∼ 0.02 fm. Therefore, this implementation of the Parallel Tempering on Boundary Conditions algorithm has the potential to substantially push forward the investigation of the QCD vacuum properties by means of lattice simulations.

Keywords