Permeable conformal walls and holography

Abstract

We study conformal field theories in two dimensions separated by domain walls, which preserve at least one Virasoro algebra. We develop tools to study such domain walls, extending and clarifying the concept of `folding' discussed in the condensed-matter literature. We analyze the conditions for unbroken supersymmetry, and discuss the holographic duals in AdS3 when they exist. One of the interesting observables is the Casimir energy between a wall and an anti-wall. When these separate free scalar field theories with different target-space radii, the Casimir energy is given by the dilogarithm function of the reflection probability. The walls with holographic duals in AdS3 separate two sigma models, whose target spaces are moduli spaces of Yang-Mills instantons on T4 or K3. In the supergravity limit, the Casimir energy is computable as classical energy of a brane that connects the walls through AdS3. We compare this result with expectations from the sigma-model point of view.

Latex file, 34 pages, 8 figures, uses JHEP3.cls. Typos corrected and references added

References in corpus (8)

• Open and Closed String Interpretation of SUSY CFT's on Branes with Boundaries
• Holography and Defect Conformal Field Theories
• Anti-de-Sitter D-branes
• Linear Models of Supersymmetric D-Branes
• N=1 supersymmetric sigma model with boundaries, II
• N=1 supersymmetric sigma model with boundaries, I
• Conformal Boundary Conditions and what they teach us
• D-branes in some near-horizon geometries

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