Abstract
We discuss partial breaking of N = 3 extended supergravity coupled to matter, and exploit conditions which enable us to find stationary points with one unbroken supersymmetry, thus avoiding the study of the scalar potential. We consider gauge groups SO(3) × K n , where K n is the gauge group of N = 3 matter. We find N = 1 extrema in anti-de Sitter space for those gauge groups K n which act as isometries of quaternionic coset spaces, surfaces of SU(3, n)/SU(3) × SU(n) × U(1). Explicit solutions for the quaternionic surfaces SO( n)/SO( n−4) × SO(4), n ⩾8, and E 6/SU(2) × SU(6), n = 78 are exhibited.
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