Modular Bootstrap for Boundary N=2 Liouville Theory

Abstract

We study the boundary N=2 Liouville theory based on the ``modular bootstrap'' approach. As fundamental conformal blocks we introduce the ``extended characters'' that are defined as the proper sums over spectral flows of irreducible characters of the N=2 superconformal algebra (SCA) and clarify their modular transformation properties in models with rational central charges. We then try to classify the Cardy states describing consistent D-branes based on the modular data. We construct the analogues of ZZ-branes (hep-th/0101152), localized at the strong coupling region, and the FZZT-branes (hep-th/0001012, hep-th/0009138), which extend along the Liouville direction. The former is shown to play important roles to describe the BPS D-branes wrapped around vanishing cycles in deformed Calabi-Yau singularities, reproducing the correct intersection numbers of vanishing cycles. We also discuss the non-BPS D-branes in 2d type 0 (and type II) string vacua composed of the N=2 Liouville with $\hat{c}(\equiv c/3)=5$. Unstable D0-branes are found as the ZZ-brane analogues mentioned above, and the FZZT-brane analogues are stable due to the existence of mass gap despite the lack of GSO projection.

52 pages, no figure; v2 a reference added, minor corrections, a footnote added in page 8; v3 comments added for clarifications, summary of proposed boundary states added, version to appear in JHEP; v4 a reference added

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• ZZ-Branes of N=2 Super-Liouville Theory
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• Modular Bootstrap of Boundary N=2 Liouville Theory
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• Falling D0-Branes in 2D Superstring Theory
• Black Hole - String Transition and Rolling D-brane
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