TY  - JOUR
AU  - Attig, N.
AU  - Lippert, T.
AU  - Neff, H.
AU  - Negele, J.
AU  - Schilling, K.
TI  - Giant eigenproblems from lattice gauge theory on CRAY T3E systems
JO  - Computer physics communications
VL  - 142
SN  - 0010-4655
CY  - Amsterdam
PB  - North Holland Publ. Co.
M1  - PreJuSER-43454
SP  - 196 - 200
PY  - 2001
N1  - Record converted from VDB: 12.11.2012
AB  - The determination of physical properties of flavor singlet objects like the eta' meson by computer simulation requires the computation of functionals of the inverse fermionic matrix M-1. So far, only stochastic methods could cope with the enormous size of M. In this paper, we introduce an alternative approach which is based on the Computation of a subset of low-lying eigenmodes of the fermionic matrix. The high quality of this 'truncated eigenmode approximation' (TEA) is demonstrated by comparison with the pion correlator, a flavor octet quantity, which is readily computable through a linear system of equations. We show that TEA can successfully approximate the flavor singlet eta' correlator. We find that the systematic error of the method is tolerable. As the determination of the chosen subset of 300 eigenmodes requires about 3.5 Tflops-hours CPU-time per canonical ensemble and at least 15 GBytes of memory, the power of high-end supercomputers like the CRAY T3E is indispensable. (C) 2001 Elsevier Science B.V. All rights reserved.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000173099200038
DO  - DOI:10.1016/S0010-4655(01)00329-0
UR  - https://juser.fz-juelich.de/record/43454
ER  -