Boundary state from Ellwood invariants

For a long time scientists suspected relation between classical solutions of open string field theory and D-brane configurations in string theory which can be described by boundary states of conformal field theory. In this paper we have proposed for the first time a very explicit construction of such a state from a given classical solution. This has opened new possibilities for using string field theory as a tool to study new boundary conditions in 2D conformal field theories.

Kudrna, Matěj ; Maccaferri, Carlo ; Schnabl, Martin; JHEP 1307 (2013) 033.