9 papers
The classical Yangian symmetry of Auxiliary Field Sigma Models
Daniele Bielli, Christian Ferko, Michele Galli +1
Integrable field theories exhibit infinitely many symmetries which underlie their solvability, but the structure of these symmetries can become obscured after performing an integra…
Entanglement cohomology for GHZ and W states
Christian Ferko, Keiichiro Furuya
Entanglement cohomology assigns a graded cohomology ring to a multipartite pure state, providing homological invariants that are stable under local unitaries and characterize inequ…
Hodge Theory for Entanglement Cohomology
Christian Ferko, Eashan Iyer, Kasra Mossayebi +1
We explore and extend the application of homological algebra to describe quantum entanglement, initiated in arXiv:1901.02011, focusing on the Hodge-theoretic structure of entanglem…
Soliton Surfaces and the Geometry of Integrable Deformations of the Model
Christian Ferko, Michele Galli, Zejun Huang +1
The model is an analytically tractable quantum field theory which shares several properties with Yang-Mills theory. By virtue of its classical integra…
Strings in AdS: one-loop partition function and near-extremal BTZ thermodynamics
Christian Ferko, Sameer Murthy, Mukund Rangamani
We revisit the computation of the string partition function in AdS focussing on the appearance of spacetime (super) symmetries. We show how the asymptotic symmetries of the AdS…
Higher-Spin Currents and Flows in Auxiliary Field Sigma Models
Daniele Bielli, Christian Ferko, Michele Galli +1
We study local, higher-spin conserved currents in integrable sigma models that have been deformed via coupling to auxiliary fields. These currents generate integrability-prese…