• Article  

      Distributed matrix scaling and application to average consensus in directed graphs 

      Domínguez-Garcia, A. D.; Hadjicostis, Christoforos N. (2013)
      We propose a class of distributed iterative algorithms that enable the asymptotic scaling of a primitive column stochastic matrix, with a given sparsity structure, to a doubly stochastic form. We also demonstrate the ...
    • Article  

      The three-loop β-function of QCD with the clover action 

      Bode, Achim; Panagopoulos, Haralambos G. (2002)
      We calculate, to 3 loops in perturbation theory, the bare β-function of QCD, formulated on the lattice with the clover fermionic action. The dependence of our result on the number of colors N, the number of fermionic flavors ...
    • Article  

      The three-loop β-function of SU(N) lattice gauge theories with Wilson fermions 

      Christou, Chris; Feo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1998)
      We calculate the third coefficient of the lattice β-function associated with the Wilson formulation for both gauge fields and fermions. This allows us to evaluate the three-loop correction (linear in g2 0) to the relation ...
    • Article  

      The two-loop relation between the bare lattice coupling and the MS coupling in QCD with Wilson fermions 

      Christou, Chris; Feo, A.; Panagopoulos, Haralambos G.; Vicari, E. (1998)
      We calculate the two-loop relation between the coupling renormalized in the MS̄ scheme and the bare lattice coupling g0 in QCD with Wilson fermions, extending the pure gauge results of Lüscher and Weisz. Our calculation ...
    • Article  

      λ-parameter of lattice QCD with the overlap-Dirac operator 

      Alexandrou, Constantia; Panagopoulos, Haralambos G.; Vicari, E. (2000)
      We compute the ratio ΛL/Λ/MS between the scale parameter ΛL, associated with a lattice formulation of QCD using the overlap-Dirac operator, and Λ/MS of the MS renormalization scheme. To this end, the necessary one-loop ...