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Stable non-BPS D-branes in Type I string theory
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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.
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Anomalies and D-branes in the Dabholkar-Park background
Stable D-branes in the Dabholkar-Park background are derived from world-sheet anomalies with boundary Majorana fermions, matching the known relative KR-theory classification and explaining its 4-fold periodicity.
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