Four point renormalized coupling constant in O(N) models

Jun, 1995
47 pages
Published in:
  • Nucl.Phys.B 459 (1996) 207-242
e-Print:
Report number:
  • IFUP-TH-24-95

Citations per year

1995200220092016202302468
Abstract: (DESY)
The renormalized zero-momentum four-point coupling grg_r of O(N)-invariant scalar field theories in dd dimensions is studied by applying the 1/N expansion and strong coupling analysis. The O(1/N) correction to the β\beta-function and to the fixed point value gr g_r~* are explictly computed. Strong coupling series for lattice non-linear sigma models are analyzed near criticality in d=2 and d=3 for several values of NN and the corresponding values of gr g_r~* are extracted. Large-N and strong coupling results are compared with each other, finding a good general agreement. For small N the strong coupling analysis in 2-d gives the best determination of g rg~*_r to date (or comparable for N=2,3 with the available Monte Carlo estimates), and in 3-d it is consistent with available ϕ 4\phi~4 field theory results.
  • 11.10 Kk
  • 11.15 Pg
  • 64.60 Fr
  • 75.10 Hk
  • field theory: scalar
  • symmetry: O(N)
  • dimension: 2
  • dimension: 3
  • coupling constant
  • expansion 1/N