Andreas Karch

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20242026

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hep-th2025

Dissipation in Open Holography

Andreas Karch, Merna Youssef

We exploit the holographic realization of a conformal theory coupled to an external bath realized via a double trace deformation and its gravity dual in terms of transparent bounda…

hep-th2025

Nonrenormalization Theorem for $N = (4, 4)$ Interface Entropy

Andreas Karch, Hirosi Ooguri, Mianqi Wang

We derive a formula for the half-BPS interface entropy between any pair of $N = (4, 4)$ theories on the same conformal manifold. This generalizes the diastasis formula derived…

cond-mat.str-el2025

Critical theories connecting gapped phases with $Z_{2} \times Z_{2}$ symmetry from the duality web

Andreas Karch, Ryan C. Spieler

We use the ideas behind the duality web to construct numerous conformal field theories mediating the phase transitions between various symmetry broken and topological phases. In pa…

Dissipation in Open Holography

Nonrenormalization Theorem for N=(4,4) Interface Entropy

Critical theories connecting gapped phases with Z2​×Z2​ symmetry from the duality web

Nonrenormalization Theorem for $N = (4, 4)$ Interface Entropy

Critical theories connecting gapped phases with $Z_{2} \times Z_{2}$ symmetry from the duality web