Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-03-15
Nucl.Phys.B564:60-85,2000
Physics
High Energy Physics
High Energy Physics - Theory
31 pages, plain LaTeX, final version to be published in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(99)00624-0
We use the boundary state formalism to study, from the closed string point of view, superpositions of branes and anti-branes which are relevant in some non-perturbative string dualities. Treating the tachyon instability of these systems as proposed by A. Sen, we show how to incorporate the effects of the tachyon condensation directly in the boundary state. In this way we manage to show explicitly that the D1 -- anti-D1 pair of Type I is a stable non-BPS D-particle, and compute its mass. We also generalize this construction to describe other non-BPS D-branes of Type I. By requiring the absence of tachyons in the open string spectrum, we find which configurations are stable and compute their tensions. Our classification is in complete agreement with the results recently obtained using the K-theory of space-time.
Frau Marialuisa
Gallot Laurent
Lerda Alberto
Strigazzi P.
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