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Dynamical overlap fermions with increased topological tunnelling

Presenter: Nigel Cundy — University of Regensburg

Nigel Cundy, Stefan Krieg, Thomas Lippert, Andreas Schaefer

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.