Permeable conformal walls and holography

Details Permeable conformal walls and holography Permeable conformal walls and holography

2001-11-23

arxiv.org/abs/hep-th/0111210v2

JHEP 0206:027,2002

Physics

High Energy Physics

High Energy Physics - Theory

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

Scientific paper

10.1088/1126-6708/2002/06/027

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.

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