We present a systematic comparison of various iterative methods to obtain the fermion propagator with both overlap and twisted mass fermions at fixed pion mass in the quenched approximation. Taking the best available algorithm in each case we find that calculations with the overlap operator are by a factor of 20-40 more expensive than with the twisted mass operator at the parameter values considered here. For the overlap operator we also compare the efficiency of various methods for calculating the topological index. © 2004 Elsevier B.V. All rights reserved.
Comparing iterative methods for overlap and twisted mass fermions / T., Chiarappa; K., Jansen; K. I., Nagai; Papinutto, MAURO LUCIO; L., Scorzato; A., Shindler; C., Urbach; U., Wenger; I., Wetzorke. - In: NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS. - ISSN 0920-5632. - 140:(2005), pp. 853-855. (Intervento presentato al convegno Lattice 2004 tenutosi a Batavia; USA) [10.1016/j.nuclphysbps.2004.11.281].
Comparing iterative methods for overlap and twisted mass fermions
PAPINUTTO, MAURO LUCIO;
2005
Abstract
We present a systematic comparison of various iterative methods to obtain the fermion propagator with both overlap and twisted mass fermions at fixed pion mass in the quenched approximation. Taking the best available algorithm in each case we find that calculations with the overlap operator are by a factor of 20-40 more expensive than with the twisted mass operator at the parameter values considered here. For the overlap operator we also compare the efficiency of various methods for calculating the topological index. © 2004 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
