paper

D-brane dynamics

arXiv:hep-th/9511043 · doi:10.1016/0370-2693(96)00238-9

Abstract

I calculate the semiclassical phase shift (), as function of impact parameter () and velocity (), when one D-brane moves past another. From its low-velocity expansion I show that, for torroidal compactifications, the moduli space of two identical D-branes stays flat to all orders in . For K3 compactifications, the calculation of the D-brane moduli-space metric can be mapped to a dual gauge-coupling renormalization problem. In the ultrarelativistic regime, the absorptive part of the phase shift grows as if the D-branes were black disks of area . The scattering of large fundamental strings shares all the above qualitative features. A side remark concerns the intriguing duality between limiting electric fields and the speed of light.

11 pages, latex. References and some extra comments added

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