Mon·Nov 12, 2001Monday·November 12, 2001

1. 01*

   Physics development of web-based tools for use in hardware clusters doing lattice physics

   P. Dreher🇺🇸 · W. Akers🇺🇸 · J. Chen🇺🇸 · Y. Chen🇺🇸 · C. Watson🇺🇸

   Jefferson Lab and MIT are developing a set of web-based tools within the Lattice Hadron Physics Collaboration to allow lattice QCD theorists to treat the computational facilities located at the two sites as a single meta-facility. The prototype Lattice Portal provides researchers the ability to submit jobs to the cluster, browse data caches, and transfer files between cache and off-line storage. The user can view the configuration of the PBS servers and to monitor both the status of all batch queues as well as the jobs in each queue. Work is starting on expanding the present system to include job submissions at the meta-facility level (shared queue), as well as multi-site file transfers and enhanced policy-based data management capabilities.

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

   Dynamical fermion algorithm for variable actions

   I. Montvay🇩🇪

   A new version of the two-step multi-boson algorithm is developed with different fermion actions in the multi-boson and noisy Metropolis steps.

   hep-latPLB(2002)·2 citations
3. 03*

   Functional Forms for Lattice Correlators at Small Times

   Danielle Blythe🇬🇧

   The analytic form of the lattice quark propagator is used to derive the functional form for short distance mesonic correlators. These are then used to calculate ``Continuum Model'' Ansatze which comprise of a pole, representing the ground state, plus a contribution for the excited states, coming from the short distance behaviour. These are compared to Monte Carlo data.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·1 citation
4. 04*

   Dynamical suppression of large instantons

   Gernot Münster🇩🇪 · Christel Kamp (University of Muenster)🇩🇪

   We investigate the distribution of instanton sizes in the framework of a simplified model for ensembles of instantons. This model takes into account the non-diluteness of instantons. The infrared problem for the integration over instanton sizes is dealt with in a self-consistent manner by approximating instanton interactions by a repulsive hard core potential. This leads to a dynamical suppression of large instantons. The characteristic features of the instanton size distribution are studied by means of analytic and Monte Carlo methods. We find a power law behaviour for small sizes, consistent with the semi-classical results. At large instanton sizes the distribution decays exponentially. The results are compared with those from lattice simulations.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·1 citation
5. 05*

   Critical structure factors of bilinear fields in O(N)-vector models

   Pasquale Calabrese🇮🇹 · Andrea Pelissetto🇮🇹 · Ettore Vicari🇮🇹

   We compute the two-point correlation functions of general quadratic operators in the high-temperature phase of the three-dimensional O(N) vector model by using field-theoretical methods. In particular, we study the small- and large-momentum behavior of the corresponding scaling functions, and give general interpolation formulae based on a dispersive approach. Moreover, we determine the crossover exponent ${\varphi }_T$ associated with the traceless tensorial quadratic field, by computing and analyzing its six-loop perturbative expansion in fixed dimension. We find: ${\varphi }_T=1.184(12)$, ${\varphi }_T=1.271(21)$, and ${\varphi }_T=1.40(4)$ for $N=2,3,5$ respectively.

   ↳ cond-mat.stat-mechhep-latPRE(2002)·31 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.