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arXiv 0901.1666hep-th
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奇异瞬子的经典解?

Classical solutions for exotic instantons?

Marco Billo', Marialuisa Frau, Laurent Gallot, Alberto Lerda, Igor Pesando

摘要:

我们认为D ~ 7/D(-1)系统是一个典型的“奇异”膜瞬子。对于像D3/D(-1)这样对应于四维规范瞬子的系统,奇异系统缺乏与瞬子大小相关的ADHM结构的玻色子混合模,它们作为经典解的可能场论解释是一个重要的开放问题。对于这个系统,我们认为它对应于所谓的SO(8)瞬子解的8维类点极限。该构型是非阿贝尔D 7作用量的四次项的解,即,在α '趋于零的极限中保持有限的项,其中弦耦合固定,保持D(-1)效应。作为相容性的必要条件,我们检验了非交换有效作用量的次项在SO(8)解上为零,这样我们取的极限是明确的。

英文摘要:

We consider the D7/D(--1) system in Type I' as a prototypical "exotic" brane instanton. With respect to systems such as the D3/D(-1) ones, which correspond to gauge instantons in four dimensions, exotic systems lack the bosonic mixed moduli w of the ADHM construction, related to the instanton size, and their possible field-theoretical interpretation as classical solutions is an important open question. For the system at hand, we propose that it corresponds to the point-like limit of the eight-dimensional so-called SO(8) instanton solution. This configuration is a solution of the quartic term of the non-abelian D7 action, i.e., the term which stays finite in the limit in which alpha' goes to zero with the string coupling fixed that preserves the D(-1) effects. As a necessary consistency condition, we check that the next order term in the non-abelian effective action vanishes on the SO(8) solution so that the limit we take is well-defined.

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