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1: Riemann surface associated to the D-brane moduli space, consisting of five copies of the complex plane. The real and imaginary part of b have been plotted horizontally, the vertical axis is the imaginary part of c. The five sheets arranged vertically at b = 0 reflect the five possibilities for c 5 = −1.
Source publication
This thesis investigates correspondences between open and closed strings. This is done on the level of coupled open-closed moduli spaces and from a string field theoretic point of view. The construction of boundary string field theory on Wess-Zumino-Witten models leads to a conjecture on closed string backgrounds appearing as non-local operators in...
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Citations
... Studying tachyon condensation is possible via two main tools, open string field theory [25][26][27] and boundary string field theory [18,[28][29][30][31][32][33]. The discussion about tachyon condensation using boundary state formalism, which is our approach in this article, is closely related to the latter because the boundary state normalization factor corresponds to disk partition function which is the main component of the latter approach. ...
The open string tachyon and U(1) gauge field as longitudinal fluctuations and
the velocity as transverse fluctuation of an arbitrary dimensional D-brane are
considered as boundary deformations of a closed superstring free action. The
path integral approach will be applied to calculate the corresponding
generalized boundary states using supersymmetrized boundary actions. Obtaining
the disk partition functions from the boundary states and studying the effect
of tachyon condensation on both of them in the NSNS and RR sectors, leads to
results that differ from the established ones.
... Non-trivial closed string backgrounds can be implemented by replacing the flat boson by (products of) CFTs which represent other target space geometries. In6789 this has been done for group-valued WZW models. With the construction presented there BSFTs in different backgrounds can be compared to each other and the impact of background shifts can be studied. ...
We study the role of closed string backgrounds in boundary string field theory. Background independence requires the introduction of dual boundary fields, which are reminiscent of the doubled field formalism. We find a correspondence between closed string backgrounds and collective excitations of open strings described by vertex operators involving dual fields. Renormalization group flow, solutions and stability are discussed in an example. Comment: Contribution to proceedings of SFT09 in 'Theoretical and Mathematical Physics', Russian Academy of Sciences
