Dynamical overlap fermions with increased topological tunnelling
arXiv:0710.1785
Abstract
We present two improvements to our previous dynamical overlap HMC algorithm. We introduce a new method of differentiating the eigenvectors of the Kernel operator, which removes an instability in the fermionic force. Secondly, by simulating part of the fermion determinant exactly, without pseudo-fermions, we are able to increase the rate of topological tunnelling by a factor of more than ten, reducing the auto-correlation.
7 pages, contribution to lattice 2007 (algorithms)
References in corpus (10)
- Exact chiral symmetry on the lattice and the Ginsparg-Wilson relation
- Analytic Smearing of SU(3) Link Variables in Lattice QCD
- Chiral Fermions on the Lattice
- Speeding up the Hybrid-Monte-Carlo algorithm for dynamical fermions
- Dynamical overlap fermions, results with hybrid Monte-Carlo algorithm
- Physics issues in simulations with dynamical overlap fermions
- Topology with Dynamical Overlap Fermions
- Numerical Methods for the QCD Overlap Operator IV: Hybrid Monte Carlo
- Low-lying Wilson Dirac operator eigenvector mixing in dynamical overlap Hybrid Monte-Carlo
- Algorithms for dynamical overlap fermions