Fractional Branes in Non-compact Type IIA Orientifolds

Abstract

We study fractional D-branes in the Type-IIA theory on a non-compact orientifold of the orbifold C^3/Z_3 in the boundary state formalism. We find that the fractional D0-branes of the orbifold theory become unstable due to the presence of a tachyon, while there is a stable D-instanton whose tachyon gets projected out. We propose that the D-instanton is obtained after tachyon condensation. We evidence this by calculating the Whitehead group of the Abelian category of objects corresponding to the boundary states as being isomorphic to Z_2.

29 pages, Latex2e minor corrections. references updated. Version accepted in JHEP

References in corpus (2)

• A quantum McKay correspondence for fractional 2p-branes on LG orbifolds
• D-brane Spectrum and K-theory Constraints of D=4, N=1 Orientifolds