Worldsheet Instantons and a Null String Limit of Born-Infeld Theory

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For a superstring theory in four spacetime dimensions, we propose a modification of the Born-Infeld action that possesses a well-defined tensionless limit. We interpret this as describing the effective target space dynamics of null strings on a D3-brane. We argue that such a modification can be induced by nonperturbative contributions from instantons in the worldsheet sigma-model describing string propagation on the brane.
11 pages; Comments and references added

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High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/194974

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/hep-th/0702173
 http://arxiv.org/abs/hep-th/0702173
 Eur.Phys.J.C53:667-672,2008
 doi:10.1140/epjc/s10052-007-0474-5

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