We are developing a new code set "Bridge++" for lattice simulations. It is aimed to be an extensible, readable, and portable workbench, while it keeps a high performance. Bridge++ covers conventional lattice actions and numerical algorithms. The code set is constructed in C++ with an object oriented programming. We explain our strategy and the basic design of Bridge++. We also present our current status of this project, including the sustained performance on several systems.
We are developing an object oriented code set "Bridge++" for simulation of lattice gauge theories. It aims to be an extensible, readable, and portable workbench while keeping sufficiently high performance in actual productive runs. This paper describes the status of two extensions. One is multi-threading with OpenMP in the recently released version 1.2. The other is a design to use arithmetic accelerator devices such as GPGPUs, which is still under developing version. Feasibility test is performed with OpenCL.
We investigate the quark mass dependence of pion sectors in the twisted mass lattice QCD, using the Wilson Chiral Perturbation Theory (WChPT). In order to consider the small quark mass regime such that m q ∼ a 2 Λ 3 , we include O(a 2 , am) terms at the leading order (LO), which induce a non-trivial phase structure at the tree level. At the next leading order (NLO), due to the presence of the twisted mass, not only pion masses but also a vacuum expectation of the neutral pion have divergences, which must be removed by local counter terms at the NLO. We demonstrate that cancellations of these divergences can be consistently performed within a framework of the WChPT. As an interesting application of the NLO calculation, we derive the twisted quark mass dependence of the pion mass at the maximal twist where the PCAC quark mass vanishes.
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