Math @ Duke

Publications [#243281] of Paul S. Aspinwall
Papers Published
 Aspinwall, PS, Pointlike instantons and the Spin(32)/ℤ_{2} heterotic string,
Nuclear Physics B, vol. 496 no. 12
(1997),
pp. 149176 [hepth/9612108]
(last updated on 2018/07/20)
Abstract: We consider heterotic string theories compactified on a K3 surface which lead to an unbroken perturbative gauge group of Spin(32)/ℤ2. All solutions obtained are combinations of two types of pointlike instanton  one "simple type" as discovered by Witten and a new type associated to the "generalized second StiefelWhitney class" as introduced by Berkooz et al. The new type of instanton is associated to an enhancement of the gauge symmetry by Sp(4) and the addition of a massless tensor supermultiplet. It is shown that if four simple instantons coalesce at an orbifold point in the K3 surface then a massless tensor field appears which may be used to interpolate between the two types of instanton. By allowing various combinations of pointlike instantons to coalesce, large gauge groups (e.g., rank 128) with many massless tensor supermultiplets result. The analysis is done in terms of Ftheory. © 1997 Elsevier Science B.V.


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