Classical p-branes from boundary state

Abstract

We show that the boundary state description of a Dp-brane is strictly related to the corresponding classical solution of the low-energy string effective action. By projecting the boundary state on the massless states of the closed string we obtain the tension, the R-R charge and the large distance behavior of the classical solution. We discuss both the case of a single D-brane and that of bound states of two D-branes. We also show that in the R-R sector the boundary state, written in a picture which treats asymmetrically the left and right components, directly yields the R-R gauge potentials.

Stringy instantons at orbifold singularities

“…This means that the disk one-point function of their vertex operators [31,32] is non vanishing when the disk boundary is attached to such D3-branes. (Indeed in this way or, equivalently, by using the boundary-state formalism [33,34], one can derive the profile for these fields. )…”

Gravitational Radiation of Rolling Tachyon

“…These fluctuations can also be understood as the linear perturbation around the flat spacetime of the following dilatonic gravity 2 in the Einstein frame [6] …”

“…The normalization constant N for the static brane is given in [6] from the factorization of the scattering amplitude. Moreover, N = √ π/32 ∼ 10 −2 for d = 26 if we set the string scale 2πl s to 1 and is independent of d t .…”

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.…”