Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-07-27
Commun.Math.Phys.213:1-17,2000
Physics
High Energy Physics
High Energy Physics - Theory
23 pages harvmac. Conventions simplified; typos corrected; references added
Scientific paper
10.1007/PL00005528
N-particle quantum mechanics described by a sigma model with an N-dimensional target space with torsion is considered. It is shown that an SL(2,R) conformal symmetry exists if and only if the geometry admits a homothetic Killing vector $D^a$ whose associated one-form $D_a$ is closed. Further, the SL(2,R) can always be extended to Osp(1|2) superconformal symmetry, with a suitable choice of torsion, by the addition of N real fermions. Extension to SU(1,1|1) requires a complex structure I and a holomorphic U(1) isometry $D^a I_a{^b} \partial_b$. Conditions for extension to the superconformal group D(2,1;\alpha), which involve a triplet of complex structures and SU(2) x SU(2) isometries, are derived. Examples are given.
Michelson Jeremy
Strominger Andrew
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