Wed·Nov 14, 2001Wednesday·November 14, 2001

1. 01*

   Connection between Tomboulis vortices and projection vortices

   A. Alexandru🇺🇸 · Richard W. Haymaker🇺🇸

   By using the freedom of picking a representative we explore connections between the Tomboulis SO(3)xZ(2) form of the partition function and the SU(2) form. We are able to express the monopole and vortex observables of the former in terms of configurations of the latter. Also we can measure Tomboulis and projection vortex counters on the same configuration to search for correlations.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·0 citations
2. 02*

   Towards the topological susceptibility with overlap fermions

   Tamas G. Kovacs (NIC/DESY Zeuthen, & Pecs U.)🇩🇪

   Using a reweighting technique combined with a low-mode truncation of the fermionic determinant, we estimate the quark-mass dependence of the QCD topological susceptibility with overlap fermions. In contrast to previous lattice simulations which all used non-chiral fermions, our results appear to be consistent with the simple continuum model of Dürr. This indicates that at current lattice spacings the use of the index theorem might not be justified and the fermionic definition of the charge might be needed.

   hep-lathep-ph12 citations
3. 03*

   Multi-Layer Structure in the Strongly Five Dimensional Abelian Higgs Model

   P. Dimopoulos🇬🇷 · K. Farakos🇬🇷 · S. Nicolis🇫🇷

   We explore the phase diagram of the 5--D anisotropic Abelian Higgs model by Monte Carlo simulations. In particular, we study the transition between the confining phase and the four dimensional layered Higgs phase. We find that, in a certain region of the lattice parameter space, this transition can be first order and that each layer moves into the Higgs phase independently of the others (decoupling of layers).

   hep-latNucl.Phys.B Proc.Suppl.(2002)·0 citations
4. 04*

   Lattice 2001: Reflections

   P. Hasenfratz🇨🇭

   A few subjects which strongly intertwine our field are discussed: K --> Pi Pi decay, chiral symmetry on the lattice and a few other selected topics. Open questions are touched also on perturbation theory, locality, Gribov copies, CP symmetry in chiral gauge theories and cut-off effects.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·37 citations
5. 05*

   Composite reweighting SU(2) QCD at Finite Temperature

   P. R. Crompton🇬🇧

   The Glasgow reweighting method is evaluated for SU(2) lattice gauge theory at nonzero \mu and finite T. We establish that the ' overlap problem' of SU(3) measurements, in which the transition points determined from thermodynamic observables have an unphysical dependence on the value of \mu used in the reweighting persists for SU(2). By combining the information from different lattice ensembles we alleviate sampling bias in the fugacity expansion, and identify the Lee-Yang zeros associated with the transition to a high density phase that can plausibly be associated with diquark condensation. We also confirm the existence of a line of first order transitions above a critical point in the T-\mu plane previously identified by effective chiral lagrangian calculations.

   hep-latNPB(2002)·12 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.