D-brane dynamics
Abstract
I calculate the semiclassical phase shift (δ), as function of impact parameter ( b) and velocity (ν), 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 α‧. 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 ∼ α‧ ln[ {1}/{(1 - ν 2) }] . 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.
- Publication:
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Physics Letters B
- Pub Date:
- February 1996
- DOI:
- 10.1016/0370-2693(96)00238-9
- arXiv:
- arXiv:hep-th/9511043
- Bibcode:
- 1996PhLB..374...37B
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- 11 pages, latex. References and some extra comments added