G. Arutyunov et al., Boundary superstring field theory annulus partition function in the presence of tachyons, J HIGH EN P, 2001(6), 2001, pp. NIL_1183-NIL_1215
We compute the Boundary Superstring Field Theory partition function on the
annulus in the presence of independent linear tachyon profiles on the two b
oundaries. The R-R sector is found to contribute non-trivially to the deriv
ative terms of the space-time effective action. In the process we construct
a boundary state description of D-branes in the presence of a linear tachy
on. We quantise the open string in a tachyonic background and address the q
uestion of open/closed string duality.