(F,Dp) bound states from the boundary state

Abstract

We use the boundary state formalism to provide the full conformal description of (F,Dp) bound states. These are BPS configurations that arise from a superposition of a fundamental string and a Dp brane, and are charged under both the NS-NS antisymmetric tensor and the (p+1)-form R-R potential. We construct the boundary state for these bound states by switching on a constant electric field on the world-volume of a Dp brane and fix its value by imposing the Dirac quantization condition on the charges. Using the operator formalism we also derive the Dirac-Born-Infeld action and the classical supergravity solutions corresponding to these configurations.Comment: 33 pages, plain LaTeX, final version published in Nucl. Phys.

Classical gauge instantons from open strings

“…A precise relation between such a background and the boundary state has been established in Refs. [6,7]. There it has been shown that if one multiplies the massless tadpoles of |Dp by free propagators and then takes the Fourier transform, one gets the leading term in the large distance expansion of the classical p-brane solutions carrying Ramond-Ramond charges which are non-perturbative configurations of Type II or Type I supergravity.…”

Boundary states as exact solutions of (vacuum) closed string field theory

“…(2.26) is a mathematically rigorous statement, it will play a fundamental rôle even if our scenario might not be so accurate. For example, in [29], it was argued that the asymptotic behavior of 1 L 0 +L 0 |B coincides with the supergravity solution at the linear level. However, at the nonlinear level, it is easy to see that it fails to be the solution of HIKKO's equation of motion.…”

Generalized supersymetric boundary state

“…The projector which extracts the relevant emission mode is studied recently in ref. [8]. In our language, the modes in V relevant for the massless emission is only the constant part (since if one excite α creation operator, the state becomes massive).…”