The Off-Shell Boundary State and Cross-Caps in the Genus Expansion of String Theory

2002/10/28 by Mark Laidlaw, M. Laidlaw, Laidlaw, M.
Computer Science · Mathematics · Physics and Astronomy · #Algorithms and Data Compression #Black Holes and Theoretical Physics #Geometric and Algebraic Topology #hep-th

paper · pdf · doi:10.48550/arxiv.hep-th/0210270

28 pages, 0 figures

arxiv created 2002/10/28 · arxiv updated 2009/11/30

Abstract

We use the boundary state formalism for the bosonic string to calculate the emission amplitude for closed string states from particular D-branes. We show that the amplitudes obtained are exactly the same as those obtained from the world-sheet sigma model calculation, and that the construction enforces the requirement for integrated vertex operators, even in the off-shell case. Using the expressions obtained for the boundary state we propose higher order terms in the string loop expansion for the background considered.

Citations

• Tachyon condensation in boundary string field theory at one loop

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