Finite cutoff on the string worldsheet?
Vipul Periwal, Øyvind Tafjord · Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields · 1999
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.