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- Justin Foley, K. Jimmy Juge, Alan Ó Cais, Mike Peardon, Sinéad M. Ryan, Jon-Ivar Skullerud
- Computer Physics Communications
- 2005

A new method for computing all elements of the lattice quark propagator is proposed. The method combines the spectral decomposition of the propagator, computing the lowest eigenmodes exactly, with noisy estimators which are 'diluted', i.e. taken to have support only on a subset of time, space, spin or colour. We find that the errors are dramatically reduced… (More)

- Alexei Bazavov, Claude Bernard, +14 authors Doug Toussaint
- 2014

The MILC Code is a body of high performance research software written in C for doing SU(3) lattice gauge theory on several different (MIMD) parallel computers in current use. In scalar mode, it runs on a variety of workstations making it extremely versatile for both production and exploratory applications. This manual is for the latest (7.7.11) version of… (More)

- Colin Morningstar, David Lenkner, +5 authors K. J. Juge
- 2015

A new method of stochastically estimating the low-lying effects of quark propagation is proposed which allows accurate determinations of temporal correlations of single-hadron and multihadron operators in lattice QCD. The method is well suited for calculations in large volumes. Contributions involving quark propagation connecting hadron sink operators at… (More)

- Gert Aarts, Chris Allton, Justin Foley, Simon Hands, Seyong Kim
- Physical review letters
- 2007

In lattice QCD, the maximum entropy method can be used to reconstruct spectral functions from Euclidean correlators obtained in numerical simulations. We show that at finite temperature the most commonly used algorithm, employing Bryan's method, is inherently unstable at small energies and gives a modification that avoids this. We demonstrate this approach… (More)

- Huey-Wen Lin, Thomas Jefferson, +19 authors Sinéad M. Ryan
- 2009

We present the first light-hadron spectroscopy on a set of N f ¼ 2 þ 1 dynamical, anisotropic lattices. A convenient set of coordinates that parameterize the two-dimensional plane of light and strange-quark masses is introduced. These coordinates are used to extrapolate data obtained at the simulated values of the quark masses to the physical light and… (More)

We present preliminary results for meson spectral functions at nonzero momentum, obtained from quenched lattice QCD simulations at finite temperature using the Maximal Entropy Method. Twisted boundary conditions are used to have access to many momenta p ∼ T. For light quarks, we observe a drastic modification when heating the system from below to above T c.… (More)

- Justin Foley
- 2008

We discuss the tuning of the anisotropic clover action and Symanzik-improved gauge action in lattice perturbation theory. The fermion action is constructed from stout-smeared spatial links, which complicates the calculation considerably. In addition, the full quark-mass dependence of the action parameters is included in this study. We present results for… (More)

- Colin Morningstar, John Bulava, +5 authors C. Morningstar
- 2016

Multi-hadron operators are crucial for reliably extracting the masses of excited states lying above multi-hadron thresholds in lattice QCD Monte Carlo calculations. The construction of multi-hadron operators with significant coupling to the lowest-lying multi-hadron states of interest involves combining single hadron operators of various momenta. The design… (More)

- Chik Him Wong, John Bulava, +4 authors Balint Joo
- 2016

- Michael Peardon, John Bulava, +7 authors Keisuke Jimmy Juge
- 2009

A new quark-field smearing algorithm is defined which enables efficient calculations of a broad range of hadron correlation functions. The technique applies a low-rank operator to define smooth fields that are to be used in hadron creation operators. The resulting space of smooth fields is small enough that all elements of the reduced quark propagator can… (More)