Maths HEP Lunchtime Seminars: Supertubes
5 October 2001 00:00 in CM221
"A "supertube" is a D0-charged IIA superstring which has been `blown up', in a Minkowski background, to a 1/4-supersymmetric cylindrical D2-brane by angular momentum.
We shall first analyze this system from the viewpoint of the D2-brane worldvolume, finding that the angular momentum J is bounded from above. Then we shall consider the gravitational backreaction and construct the exact supergravity solution describing the system, which captures all its essential features, including the D2 dipole moment and the bound on J; violation of the bound implies violation of causality in spacetime and ghost-induced instabilities on supertube probes.
We shall also speculate on a possible gauge theory/gravity duality between the (non-commutative) worldvolume theory on the supertube and the supergravity solution. We shall finally comment on supertubes ending on D4-branes: the S^1 boundary of the D2-brane is a magnetic monopole loop for the gauge field on the D4.