9 papers
Sp(4,Z) actions on 3d U(1)^2 symmetric theories: Order-five duality and bilayer quantum Hall hierarchies
Yasin F. Alam, Andreas Karch, Da-Chuan Lu +1
The electromagnetic duality of 4d Maxwell theory induces theory-generating operations on 3d theories with global symmetry. For theories with $U(1…
One-point functions in 2D and 4D SUSY Janus
Andreas Karch, Ainesh Sanyal, Ryan C. Spieler +1
We calculate one-point functions of the marginal operators dual to the space-varying dilaton in 4D and 2D holographic Janus interfaces, extending the results of \cite{Clark_2005}.…
Wet Hair: Global Symmetries in Entanglement Islands
Hao Geng, Jesús Huertas, Andreas Karch +2
A central conjecture in quantum gravity is the non-existence of global symmetries. As a fully unitary theory, there is no information loss in a UV complete quantum gravity theory.…
Universality of Dissipation across Holographic Interfaces
Andreas Karch, Mianqi Wang
Motivated by recent results in spin chains we study dissipation and relaxation in a two-dimensional \ak{holographic} interface conformal field theory (ICFT) in which degrees of fre…
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…
Nonrenormalization Theorem for Interface Entropy
Andreas Karch, Hirosi Ooguri, Mianqi Wang
We derive a formula for the half-BPS interface entropy between any pair of theories on the same conformal manifold. This generalizes the diastasis formula derived…
Critical theories connecting gapped phases with 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…
Transmission Coefficient of Super-Janus Solution
Saba Baig, Andreas Karch, Mianqi Wang
We calculate the transmission coefficient of the super-Janus interface conformal field theory, both at weak and at strong coupling, where latter is described holographically as a d…
Universal Bound on Effective Central Charge and Its Saturation
Andreas Karch, Yuya Kusuki, Hirosi Ooguri +2
The effective central charge (denoted by ) is a measure of entanglement through a conformal interface, while the transmission coefficient (encoded in the coefficien…