Abstract
A minimal single brane holographic model can be used as a dual to 2d conformal interfaces (ICFTs) to calculate the transmission coefficient \( \mathcal{T} \) of energy transported across the defect as well as boundary entropy log g, the additional entanglement entropy for some sub-region that encloses the defect. Both \( \mathcal{T} \) and log g are uniquely determined by the tension characterizing the brane. In contrast, in field theory defects typically the transmission coefficient can be dialed from 0 to 1 independently for each allowed value of log g. To address this discrepancy, we look at a double brane (3-region bulk) holographic model. Merger of two single brane interfaces creates genuinely new interfaces which indeed allow a range of accessible transmission coefficients for a fixed value of log g. In particular, the \( \mathcal{T} \) = 0 limit of two completely decoupled BCFTs can be achieved.
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Baig, S.A., Karch, A. Double brane holographic model dual to 2d ICFTs. J. High Energ. Phys. 2022, 22 (2022). https://doi.org/10.1007/JHEP10(2022)022
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DOI: https://doi.org/10.1007/JHEP10(2022)022