Title:
The boundary state from open string fields

Abstract:
It is expected that there is a correspondence between boundary
conformal field theories and solutions of open string field
theory. It has been, however, difficult to extract information
on the boundary CFT from the solution. We construct a class of
BRST-invariant closed string states from open string fields
and claim that they coincide with the boundary state
of the boundary CFT up to a possible BRST-exact term.
We explicitly calculate the closed string state for various
known analytic solutions and find that it precisely coincides
with the boundary state without any BRST-exact term. The talk
is based on arXiv:0810.1737 in collaboration with Kiermaier
and Zwiebach.