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Tachyon condensation in string field theory
Ashoke Sen, Barton Zwiebach
It has been conjectured that at a stationary point of the tachyon potential for the D-brane of bosonic string theory, the negative energy density exactly cancels the D-brane tensio…
Universality of the Tachyon Potential
Ashoke Sen
Using string field theory, we argue that the tachyon potential on a D-brane anti-D-brane system in type II string theory in arbitrary background has a universal form, independent o…
Supersymmetric World-volume Action for Non-BPS D-branes
Ashoke Sen
We construct the world-volume action for non-BPS D-branes in type II string theories. This action is invariant under all the unbroken supersymmetries in the bulk, but these symmetr…
Non-supersymmetric D-Brane Configurations with Bose-Fermi Degenerate Open String Spectrum
Matthias R Gaberdiel, Ashoke Sen
The spectrum of open strings on various non-BPS D-brane configurations in type II string theory on a K3 orbifold is analysed. At a generic point in the corresponding moduli space t…
Stable Non-BPS States in F- theory
Ashoke Sen, Barton Zwiebach
F-theory on K3 admits non-BPS states that are represented as string junctions extending between 7-branes. We classify the non-BPS states which are guaranteed to be stable on accoun…
`Blowing up' D-branes on Non-supersymmetric Cycles
Jaydeep Majumder, Ashoke Sen
In the orbifold limit of K3, one can give exact conformal field theory description of D-branes wrapped on certain non-supersymmetric cycles of K3. We study the effect of switching…