A finite cutoff on the string worldsheet?

Details A finite cutoff on the string worldsheet? A finite cutoff on the string worldsheet?

1998-03-24

arxiv.org/abs/hep-th/9803195v2

Phys.Rev. D60 (1999) 046004

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, RevTex; v2: typos corrected, superstring calculation included, discussion expanded - to be published in Phys.Rev. D

Scientific paper

10.1103/PhysRevD.60.046004

D-brane backgrounds are specified in closed string theories by holes with appropriate mixed Dirichlet and Neumann boundary conditions on the string worldsheet. As presently stated, the prescription defining D-brane backgrounds is such that the Einstein equation is not equivalent to the condition for scale invariance on the string worldsheet. A modified D-brane prescription is found, that leads to the desired equivalence, while preserving all known D-brane lore. A possible interpretation is that the worldsheet cutoff is finite. Possible connections to recent work of Maldacena and Strominger, and Gopakumar and Vafa are suggested.

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