7 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 the one-point functions of the marginal operator dual to the space-varying dilaton in 4D and 2D holographic Janus interfaces, extending results in arXiv…
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 holographic interface conformal field theory (ICFT) in which degrees of freedom…
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.…
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…
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…