**
Below is the ascii version of the abstract for 06-271.
The html version should be ready soon.**Fumio Hiroshima, Itaru Sasaki
Enhanced binding for N-particle system interacting with a scalar bose field I
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ABSTRACT. An enhanced binding of an $N$-particle system interacting through a scalar bose field is investigated, where $N\geq 2$. It is not assumed that this system has a ground state for a zero coupling. It is shown, however, that there exists a ground state for a sufficiently large values of coupling constants. When the coupling constant is sufficiently large, $N$ particles are bound to each other by the scalar
bose field, and are trapped by external potentials. Basic ideas of the proofs in this paper are applications of a weak coupling limit and a modified HVZ theorem.