Browsing by Author "Campostrini, M."

Now showing items 1-10 of 10

    • Article  

      Cooling and the string tension in lattice gauge theories 

      Campostrini, M.; Di Giacomo, A.; Maggiore, M.; Panagopoulos, Haralambos G.; Vicari, E. (1989)
      We explore the possibility of improving the determination of the string tension using the cooling method. We present preliminary results for the gauge group SU(2): We find that statistical errors are drastically reduced ...
    • Article  

      Lattice multiplicative renormalization beyond 1-loop 

      Allés, B.; Campostrini, M.; Feo, A.; Panagopoulos, Haralambos G. (1994)
      This is a progress report on a computational scheme for the perturbative evaluation of lattice renormalization functions. This scheme, implemented as a package on a symbolic manipulation computer language, has already ...
    • Article  

      Lattice perturbation theory by computer algebra: A three-loop result for the topological susceptibility 

      Allés, B.; Campostrini, M.; Feo, A.; Panagopoulos, Haralambos G. (1994)
      We present a scheme for the analytic computation of renormalization functions on the lattice, using a symbolic manipulation computer language. Our first nontrivial application is a new three-loop result for the topological ...
    • Article  

      The proton matrix element of the topological charge in quenched QCD 

      Allés, B.; Campostrini, M.; Del Debbio, L.; Di Giacomo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1994)
      We compute on the lattice the on-shell proton matrix element of the topological charge density in the quenched approximation. Our calculation makes use of a nonperturbative means of determining the multiplicative renormalization ...
    • Article  

      String tension and flux tubes on the lattice 

      Campostrini, M.; Di Giacomo, A.; Maggiore, M.; Olejník, S.; Panagopoulos, Haralambos G.; Vicari, E. (1990)
      We use the cooling technique to study the string tension in pure SU(2) gauge theory. We find that statistical errors are drastically reduced and at the same time the string tension is preserved through many cooling steps. ...
    • Article  

      The three-loop lattice free energy 

      Allés, B.; Campostrini, M.; Feo, A.; Panagopoulos, Haralambos G. (1994)
      We calculate the free energy of SU(N) gauge theories on the lattice, to three loops. Our result, combined with Monte Carlo data for the average plaquette, gives a more precise estimate of the gluonic condensate. © 1994.
    • Article  

      Three-loop results on the lattice 

      Allés, B.; Campostrini, M.; Feo, A.; Panagopoulos, Haralambos G. (1993)
      We present some new three-loop results in lattice gauge theories, for the Free Energy and for the Topological Susceptibility. These results are an outcome of a scheme which we are developing (using a symbolic manipulation ...
    • Article  

      Topological charge, renormalization and cooling on the lattice 

      Campostrini, M.; Di Giacomo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1990)
      We show that a definition of the topological susceptibility χ on the lattice in terms of local fields, with the proper additive and multiplicative renormalizations, is well defined, self-consistent and compatible with ...
    • Article  

      The topological susceptibility of the pure SU(3) Yang-Mills vacuum on the lattice 

      Campostrini, M.; Di Giacomo, A.; Gündüc, Y.; Lombardo, M. P.; Panagopoulos, Haralambos G.; Tripiccione, R. (1990)
      Using a "field theoretic" approach, we compute the topological susceptibility χ of the pure gauge SU(3) theory on the lattice. We also apply an algorithm of gradual cooling, and use these two approaches as a cross-check ...
    • Article  

      The topological susceptibility on the lattice 

      Campostrini, M.; Di Giacomo, A.; Panagopoulos, Haralambos G. (1988)
      We study the multiplicative renormalization of the topological charge operator on the lattice with respect to the continuum. Apparent discrepancies between different methods of determination of the topological charge on ...