News and updates

Allocation status:

99%

As of January 8, 2009: 474,394 of 480,000 6n node-hours (99%) remain.

Summary:

The goal of the 10-flavor Yang-Mills project is to measure the running coupling of a QCD-like theory with 10 flavors of light fermion. This is an extension of prior work at 8 and 12 flavors, which established the presence of a conformal transition in that range. This project seeks to narrow down the value of the transition, as well as generally studying the flavor dependence of the behavior of the running coupling in this range. PI Ethan Neil was awarded a class B allocation for this project through the USQCD collaboration for the 2008-2009 project year.

Project status as of 01/08/09:

  • Production running still has not yet begun.
  • Non-perturbative tuning is well underway; results cannot be released until the project is completed.
  • Methods and code for analysis have been further refined on the 8- and 12-flavor data, with bootstrap estimation now used to estimated two-sided errors.
  • Current priorities are:
    • Code development for Chroma; improved action, coupling measurement. Merging of changes back into main Chroma branch.
    • Coupling measurement at weak lattice coupling, to compare with perturbation theory.
    • Initiation of production running.

Updates:

01/08/09: Update on current project status.

08/13/08: Overhaul of the LSD website, and first project update!