We discuss an instability in the leapfrog integration algorithm, widely used in current Hybrid Monte Carlo (HMC) simulations of lattice QCD. We demonstrate the instability in the simple harmonic oscillator (SHO) system where it is manifest. We demonstrate the instability in HMC simulations of lattice QCD with dynamical Wilson-Clover fermions and discuss implications for future simulations of la...

The Wilson fermion determinant can be written as product of the determinants of two hermitian positive definite matrices. This formulation allows to simulate non-degenerate quark flavors by means of the hybrid Monte Carlo algorithm. A major numerical difficulty is the occurrence of nested inversions. We construct a Uzawa iteration scheme which treats the nested system within one iterative process.

We present first, exploratory results of a hybrid Monte-Carlo algorithm for dynamical, n f =2, four-dimensional QCD with overlap fermions. As expected, the computational requirements are typically two orders of magnitude larger for the dynamical overlap formalism than for the more conventional (Wilson or staggered) formulations.

This document specifies how to use Elliptic Curve Digital Signature Algorithm (ECDSA) with XML Signatures. The mechanism specified provides integrity, message authentication, and/or signer authentication services for data of any type, whether located within the XML that includes the signature or included by reference. Blake-Wilson, et al. Informational [Page 1] RFC 4050 ECDSA for XML Digital Si...

This document specifies how to use Elliptic Curve Digital Signature Algorithm (ECDSA) with XML Signatures. The mechanism specified provides integrity, message authentication, and/or signer authentication services for data of any type, whether located within the XML that includes the signature or included by reference. Blake-Wilson, et al. Informational [Page 1] RFC 4050 ECDSA for XML Digital Si...

We present the first results obtained with a Hybrid Molecular Dynamics algorithm applied to an N = 1 SU(2) Super-Yang–Mills on the lattice. We derive the Hamilton equations of motion for the system with Wilson gluinos and present preliminary results on small lattices.

bacground: wilson's disease is a rare autosomal recessive disorder characterized by toxic accumulation of copper in liver and brain. the disorder is caused by mutations in the atp7b gene, encoding a copper transporting p-type atpase. characterization of the spectrum of mutations in this gene is important both for diagnosis and genetic counseling of the families.materials and methods: we en...

Despite several attempts, no efficient cluster algorithm has been constructed for CP (N − 1) models in the standard Wilson formulation of lattice field theory. In fact, there is a no-go theorem that prevents the construction of an efficient Wolff-type embedding algorithm. In this paper, we construct an efficient cluster algorithm for ferromagnetic SU (N)-symmetric quantum spin systems. Such sys...

In this paper we extend the loop-erased random walk (LERW) to the directed hypergraph setting. We then generalize Wilson’s algorithm for uniform sampling of spanning trees to directed hypergraphs. In several special cases, this algorithm perfectly samples spanning hypertrees in expected polynomial time. Our main application is to the reachability problem, also known as the directed all-terminal...