Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1992-08-28
Nucl.Phys.B392:3-38,1993
Physics
High Energy Physics
High Energy Physics - Theory
35 pages plain tex, CERN-TH.6612/92 THU-92-18
Scientific paper
10.1016/0550-3213(93)90195-U
We study non-linear sigma models with N local supersymmetries in three space-time dimensions. For N=1 and 2 the target space of these models is Riemannian or Kahler, respectively. All N>2 theories are associated with Einstein spaces. For N=3 the target space is quaternionic, while for N=4 it generally decomposes into two separate quaternionic spaces, associated with inequivalent supermultiplets. For N=5,6,8 there is a unique (symmetric) space for any given number of supermultiplets. Beyond that there are only theories based on a single supermultiplet for N=9,10,12 and 16, associated with coset spaces with the exceptional isometry groups $F_{4(-20)}$, $E_{6(-14)}$, $E_{7(-5)}$ and $E_{16(+8)}$, respectively. For $N=3$ and $N\geq5$ the $D=2$ theories obtained by dimensional reduction are two-loop finite.
Nicolai Hermann
Tollsten A. K.
Wit Bernard de
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