Branes, orientifolds and the creation of elementary strings

Abstract

The potential of a configuration of two Dirichlet branes for which the number of ND-directions is eight is determined. Depending on whether one of the branes is an anti-brane or a brane, the potential vanishes or is twice as large as the dilatongravitational potential. This is shown to be related to the fact that a fundamental string is created when two such branes cross. Special emphasis is given to the D0-D8 system, for which an interpretation of these results in terms of the massive IIA supergravity is presented. It is also shown that the branes cannot move nonadiabatically in the transverse direction. The configuration of a zero brane and an orientifold 8-plane is analyzed in a similar way, and the implications for the type IA-heterotic duality and the heterotic matrix theory are discussed. *

A Classification of Long-Range Interactions between Two Stacks of p & p′ -Branes

“…half-string creation [4,5,9,10] between D0-branes and D8-branes. The detail analysis can be found in [6] and [1].…”

“…For fundamental strings or the so-called NSNS 5-branes, they carry the so-called NS-NS charge, while for Dp-branes, each of them carries a so-called R-R charge. Just like the electric charge, any two branes of the same type experience also a charge interaction and sometimes even for branes of different type, such as the one between D0 and D8 branes (there exists also a charge interaction between the two) [4,5,6]. These basic branes are actually stable, usually called BPS-branes, since in proper units their mass and charge are equal.…”

The past, puzzles, and promise of 6-branes

“…Consider for example a system with a single D0-brane and a single D8-brane and suppose that the boundary conditions are such that the ten-form Ramond-Ramond gauge field takes the symmetric values ±1/2 of the fundamental quantum on either side of the D8-brane domain wall. Then, the brane-source charge arguments above (or, equivalently the arguments of [18,19] in type IIA supergravity [20] and the arguments of [21,22,23,24,25,26,27] in related contexts) lead to the conclusion that exactly 1/2 of a fundamental string must end on the D0-brane. While this seems to be at odds with charge quantization, several possible resolutions immediately present themselves.…”

Interaction of dynamical fractional branes with background fields: Superstring calculations

“…In addition, the boundary states in the closed string channel elaborate all properties of the D-branes, such as their dynamics [2], [3], [4], [5], [6], [7]. Precisely, the boundary state formalism can be used to investigate the interactions between the D-branes.…”

“…According to the paper [27] and the following references therein [5,6,7, 65], the orbifold conformal field theory is obtained with a non-trivial background B-field. This implies that the Cardy's condition for our setup, i.e., that in the presence of the background fields and the velocities which have resemblance with the electric components of the anti-symmetric B-field, is satisfied.…”