2 papers
hep-lat2026
Diagonal Kenney-Laub Rational Approximation to the Overlap Operator using Wilson and Brillouin Kernel
Stephan Durr, Stylianos Gregoriou, Giannis Koutsou
We propose a formulation of the overlap Dirac operator in lattice QCD that employs diagonal Kenney-Laub (KL) iterates to approximate the matrix sign function. KL iterates require n…
hep-lat2025
Diagonal Kenney-Laub Rational Approximation to the Overlap Dirac Operator
Stephan Durr, Stylianos Gregoriou, Giannis Koutsou
We propose a practical formulation of the overlap Dirac operator in lattice QCD that employs the diagonal Kenney-Laub rational iterates - expressed via their partial fraction decom…