Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-08-22
Phys.Lett. B522 (2001) 327-334
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, LaTex; minor changes, references added
Scientific paper
10.1016/S0370-2693(01)01293-X
We consider multiplet shortening for BPS solitons in N=1 two-dimensional models. Examples of the single-state multiplets were established previously in N=1 Landau-Ginzburg models. The shortening comes at a price of loosing the fermion parity $(-1)^F$ due to boundary effects. This implies the disappearance of the boson-fermion classification resulting in abnormal statistics. To count such short multiplets we introduce a new index. We consider the phenomenon of shortening in a broad class of hybrid models which extend the Landau-Ginzburg models to include a nonflat metric on the target space. Our index turns out to be related to the index of the Dirac operator on the soliton moduli space. The latter vanishes in most cases implying the absence of shortening. We also generalize the anomaly in the central charge to take into account the target space metric.
Losev Andrei
Shifman Michael
Vainshtein Alek
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