Branes within Branes

Abstract

We discuss a set of universal couplings between superstring Ramond-Ramond gauge fields and the gauge fields internal to D-branes, with emphasis on their topological consequences, and argue that instanton solutions in these internal theories are equivalent to D-branes. A particular example is the Dirichlet 5-brane in type I theory, which Witten recently showed is is the zero size limit of an SO(32) instanton. Its effective world-volume theory is an Sp(1) gauge theory, unbroken in the zero size limit. We show that the zero size limit of an instanton in this theory is a 1-brane, which can be described as a bound state of the Dirichlet 1-brane with the 5-brane. Considering several 1 and 5-branes provides a description of moduli spaces of Sp(N ) instantons, and a type II generalization is given which should describe U (N ) instantons.December 1995

Microscopic formulation of black holes in string theory

“…This agrees with the tension of Q 1 D1-branes, namely Q 1 /g s . If one is dealing with non-compact D5-branes and D1-branes it is seen that the D-flatness conditions of the D1-brane theory is identical to the ADHM construction of Q 1 instantons of U(Q 5 ) gauge theory [117]. In fact, the last two equations in (4.13) are the relevant ADHM equations in this case [118].…”

Soft supersymmetry breaking in Calabi–Yau orientifolds with D-branes and fluxes

“…Moreover, generically D-branes contain lower dimensional D-brane charges, and hence interact also with lower degree RR-forms [51]. All these couplings to the bulk are implemented in the Chern-Simons action in a way compatible with T-duality.…”

Three-charge supertubes in a rotating black hole background

“…6 Unlike the other charges, q F 1 has a value that in general depends on the black hole charges, as well as the position and velocity of the supertube, as we will see in section 5. Its form in a BPS configuration is 17) where V 6 is the full spatial six-volume (2π) 6 R z 4 .…”

“…If, as conjectured, the CY solution is the only solution of minimal five dimensional supergravity that reduces to the BMPV black hole in the BPS limit, it seems that no black hole is a suitable candidate for the end product of such a merger. 17 Instead, other black objects and combinations of them must be considered, and in [12] it was suggested that the black hole could fragment into a pair of black rings, or a black ring encircling a rotating black hole. Some properties of black rings are given in appendix C. The above analysis of the entropy extends the previous notion of black hole fragmentation.…”