Current status of Dynamical Overlap project

We discuss the adaptation of the Hybrid Monte Carlo algorithm to overlap fermions. We derive a method which can be used to account for the delta function in the fermionic force caused by the differential of the sign function. We discuss the algoritmic difficulties that have been overcome, and mention those that still need to be solved.Comment: Talk given at Workshop on Computational Hadron Physics, Nicosia, September 2005. 8 page

“Failing Our Veterans: The G.I. Bill and the Vietnam Generation (Book Review)” by Mark Boulton

Review of Failing Our Veterans: The G.I. Bill and the Vietnam Generation by Mark Boulto

Death or Deliverance: Canadian Courts Martial in the Great War (Book Review) by Teresa Iacobelli

Review of Death or Deliverance: Canadian Courts Martial in the Great War. Teresa Iacobelli. Vancouver: University of British Columbia Press, 2013. Pp. 175

Chiral symmetry breaking and topology for all N

We investigate spontaneous chiral symmetry breaking in SU(N) gauge theories at large N using overlap fermions. The exact zero modes and the low-lying modes of the Dirac operator provide the tools to gain insight into the interplay between chiral symmetry breaking and topology. We find that topology indeed drives chiral symmetry breaking at N=3 as well as at large N. By comparing the results on various volumes and at different lattice spacings we are able to show that our conclusions are not affected by finite volume effects and also hold in the continuum limit. We then address the question whether the topology can be usefully described in terms of instantons.Comment: Talk at Lattice 2003 (chiral); 3 pages, 2 figures, espcrc2.st

Low-lying Wilson Dirac operator eigenvector mixing in dynamical overlap Hybrid Monte-Carlo

Current dynamical overlap fermion hybrid Monte Carlo simulations encounter large fermionic forces when there is mixing between near zero-eigenvectors of the kernel operator. This leads to low acceptance rates when there is a large density of near zero eigenvectors. I present a method where these large forces are eliminated and the large action jumps seen when two eigenvectors approach zero are significantly reduced. This significantly increases the stability of the algorithm, and allows the use of larger integration time steps.Comment: 20 Pages, 4 figures; v2 with minor modifications; v3 further minor modifications, as accepted by Computer Physics Communication