Now showing items 1-5 of 5

    • Algebraic properties of the bethe ansatz for an spl(2,1)-supersymmetric t-j model 

      Foerster, Angela; Karowski, Michael (1993) [Journal article]
      We investigate the algebraic structure of the supersymmetric t−J model in one dimension. We prove that the Bethe ansatz states are highest-weight vectors of an spl(2,1) superalgebra. By acting with shift operators we ...
    • Bethe Ansatz and exact form factors of the O(N) Gross Neveu-model 

      Babujian, Hratchya M.; Foerster, Angela; Karowski, Michael (2016) [Journal article]
      We apply previous results on the O(N) Bethe Ansatz [1{3] to construct a general form factor formula for the O(N) Gross-Neveu model. We examine this formula for several operators, such as the energy momentum, the spin- eld ...
    • Exact form factors in integrable quantum field theories : the scaling Z(N)-ising model 

      Babujian, Hratchya M.; Foerster, Angela; Karowski, Michael (2006) [Journal article]
      A general form factor formula for the scaling Z(N)-Ising model is constructed. Exact expressions of all matrix elements are obtained for several local operators. In addition, the commutation rules for order, disorder ...
    • Exact form factors of the O(N) σ-model 

      Babujian, Hratchya M.; Foerster, Angela; Karowski, Michael (2013) [Journal article]
      A general form factor formula for the O(N) σ-model is constructed and applied to several operators. The large N limits of these form factors are computed and compared with the 1/N expansion of the O(N) σ-model in terms of ...
    • Exact form factors of the SU(N) Gross–Neveu model and 1/N expansion 

      Babujian, Hratchya M.; Foerster, Angela; Karowski, Michael (2010) [Journal article]
      The general SU(N) form factor formula is constructed. Exact form factors for the field, the energy–momentum and the current operators are derived and compared with the 1/N-expansion of the chiral Gross–Neveu model and full ...