VARIATIONAL ASPECTS OF FADDEEV CALCULATIONS

We examine differences between H-3 binding energies obtained by solvin g the Faddeev equations using standard partial-wave expansion procedur es and results from solving the Schrodinger equation by means of the c oupled-rearrangement-channel variational method. Variational bounds ge nerated from Faddeev solutions for several contemporary, realistic pot ential models are presented as a function of the number of partial wav es retained in the potential expansion. We demonstrate that the Faddee v wave function yields an optimal variational bound for the partial-wa ve truncated potential from which it is generated, but it does not yie ld optimal bounds for the full Hamiltonian or when the potential is pa rtial-wave truncated at a different level. Finally, qualitative differ ences between H-3 solutions for static models such as the AV14 and RSC potentials and for momentum-dependent models such as the Nijmegen sof t-core and Paris potentials are explored, and comparison is made with solutions for the RSC/TM two-body-force plus three-body-force model.