# The BCFT boundary state from open string fields

M. Kiermaier (MIT)

22.07.2009 at 10:30

A new gauge choice for string fields, Schnabl gauge, has triggered remarkable analytic progress in cubic open string field theory. In this talk I will not focus on the newly found analytic solutions. Instead, I will demonstrate that the geometry of Riemann surfaces implied by Schnabl's gauge choice radically simplifies the computation of one-loop scattering amplitudes. Using this simplification, one can also gain insights into the connection between the solutions of open string field theory and the space of boundary conformal field theories (BCFT's). In particular, the BCFT boundary state associated with known analytic solutions can now be explicitly constructed from the solutions.

Arnold Sommerfeld Center

Theresienstrasse 37

Room 348/349