出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present an implementation of the disconnected diagram contributions to quantities such as the flavor-singlet pseudoscalar meson mass which are accelerated by GPGPU technology utilizing the NVIDIA CUDA platform. To enable the exact evaluation of the disconnected loops we use a 16332 lattice and Nf =2Wilson fermions simulated by the SESAM Collaboration. The disconnected loops are also computed using stochastic methods with several noise reduction techniques. In particular, we analyze various dilution schemes as well as the recently proposed truncated solver method. We find consistency among the different methods used for the determination of the h0 mass, albeit that the gauge noise for the ensemble studied is large. We also find that the effect of ’dilution’ does not go beyond that of optimal statistical noise in many cases. It has been observed, however, that spin dilution does have a significant effect for some quantities studied.
