Tue·Sep 25, 2001Tuesday·September 25, 2001

1. 01*

   Self-Duality and Statistical Systems without Internal Energy Scaling Terms at Criticality

   M. A. Yurishchev🇷🇺

   It is argued that self-duality of one system leads to the zero finite-size scaling amplitude of the critical internal energy for all system belonging to the same universality class. For such models, we may expect that condition of equality (up to correction-to-scaling terms) of the internal energies for systems with different sizes will yield more accurate estimates for the critical temperature than the scaling equation for the inverse correlation lengths which is used in the standard phenomenological renormalization-group approach. Analytical and numerical evidences confirming the above conjecture are given for examples of two-dimensional next-nearest-neighbour and spin-1 Ising lattices.

   hep-latcond-matNucl.Phys.B Proc.Suppl.(2002)·1 citation
2. 02*

   Heavy light decay constants on the lattice

   UKQCD Collaboration · C.M. Maynard

   We present results for the leptonic decays of heavy-light mesons in the quenched approximation and a preliminary result for f_Ds with dynamical fermions for Nf=2. We examine the systematic effects of extrapolating the decay constants from the charm to the bottom quark mass, and find this extrapolation to be under control. We present a preliminary result for f_Ds{Nf=2} and compare to f_Ds{Nf=0} matched to have the same lattice spacing set by the Sommer scale, r0. We find no significant difference.

   hep-latNucl.Phys.B Proc.Suppl.(2002)·12 citations
3. 03*

   Kosterlitz-Thouless Universality in a Fermionic System

   Shailesh Chandrasekharan🇺🇸 · James C. Osborn🇺🇸

   A new extension of the attractive Hubbard model is constructed to study the critical behavior near a finite temperature superconducting phase transition in two dimensions using the recently developed meron-cluster algorithm. Unlike previous calculations in the attractive Hubbard model which were limited to small lattices, the new algorithm is used to study the critical behavior on lattices as large as $128\times 128$. These precise results for the first time show that a fermionic system can undergo a finite temperature phase transition whose critical behavior is well described by the predictions of Kosterlitz and Thouless almost three decades ago. In particular it is confirmed that the spatial winding number susceptibility obeys the well known predictions of finite size scaling for $T<T_c$ and up to logarithmic corrections the pair susceptibility scales as $L^{2-\eta }$ at large volumes with $0\le \eta \le 0.25$ for $0\le T\le T_c$.

   ↳ cond-mat.str-elhep-lathep-phPRB(2002)·16 citations
4. 04*

   Problems with lattice methods for electroweak preheating

   Guy D. Moore🇺🇸

   Recently Garcia Bellido et. al. have proposed that electroweak baryogenesis may occur at the end of inflation, in a scenario where the reheat temperature is too low for electroweak symmetry restoration. I show why the scenario is difficult to test reliably by classical field techniques on the lattice.

   ↳ hep-phhep-latJHEP(2001)·31 citations
5. 05*

   Finite Temperature Behavior of the 3D Polyakov Model with Massless Quarks

   Nikita O. Agasian (ITEP, Moscow)🇷🇺 · Dmitri Antonov (INFN, Pisa and University of Pisa)🇮🇹

   The (2+1)D Georgi-Glashow (or Polyakov) model with the additional fundamental massless quarks is explored at finite temperature. In the case of vanishing Yukawa coupling, it is demonstrated that the interaction of a monopole and an antimonopole in the molecule via quark zero modes leads to the decrease of the Berezinsky-Kosterlitz-Thouless critical temperature when the number of quark flavors is equal to one. If the number of flavors becomes larger, monopoles are shown to exist only in the molecular phase at any temperatures exceeding a certain exponentially small one. This means that for such a number of flavors and at such temperatures, no fundamental matter can be confined by means of the monopole mechanism.

   ↳ hep-thcond-mat.stat-mechhep-lathep-phPLB(2002)·19 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.