34 citations · 70 across the 15 of their papers we have counts for
15 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…
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…
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…
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…
-like Flows of Yang-Mills Theories
Christian Ferko, Jue Hou, Tommaso Morone +2
We study -like deformations of Yang-Mills theories. The standard flows lead to multi-trace Lagrangians, and the non-Abelian gauge structure…
Auxiliary Field Deformations of (Semi-)Symmetric Space Sigma Models
Daniele Bielli, Christian Ferko, Liam Smith +1
We generalize the auxiliary field deformations of the principal chiral model (PCM) introduced in arXiv:2405.05899 and arXiv:2407.16338 to sigma models whose target manifolds are sy…
Integrable Higher-Spin Deformations of Sigma Models from Auxiliary Fields
Daniele Bielli, Christian Ferko, Liam Smith +1
We construct a new infinite family of integrable deformations of the principal chiral model (PCM) parameterized by an interaction function of several variables, which extends the f…
T-Duality and -like Deformations of Sigma Models
Daniele Bielli, Christian Ferko, Liam Smith +1
We initiate the study of the interplay between T-duality and classical stress tensor deformations in two-dimensional sigma models. We first show that a general Abelian T-duality co…
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…
Auxiliary Field Sigma Models and Yang-Baxter Deformations
Daniele Bielli, Christian Ferko, Liam Smith +1
We combine the Yang-Baxter (YB) and bi-Yang-Baxter (bi-YB) deformations with higher-spin auxiliary field deformations to construct multi-parameter families of integrable deformatio…
Field-Dependent Metrics and Higher-Form Symmetries in Duality-Invariant Theories of Non-Linear Electrodynamics
Christian Ferko, Cian Luke Martin
We prove that a theory of non-linear electrodynamics has equations of motion which are equivalent to those of the Maxwell theory in curved spacetime, but with the usual metric…
Infinite Family of Integrable Sigma Models Using Auxiliary Fields
Christian Ferko, Liam Smith
We introduce a class of sigma models which are parameterized by a function of one variable. In addition to the physical field , these models include an auxiliary field $v_α…
Interacting Chiral Form Field Theories and -like Flows in Six and Higher Dimensions
Christian Ferko, Sergei M. Kuzenko, Kurt Lechner +2
In this paper we initiate the study of six-dimensional non-linear chiral two-form gauge theories as deformations of free chiral two-form gauge theories driven by stress-tensor $T\o…
Flows in the Space of Interacting Chiral Boson Theories
Stephen Ebert, Christian Ferko, Cian Luke Martin +1
We study interacting theories of left-moving and right-moving Floreanini-Jackiw bosons in two dimensions. A parameterized family of such theories is shown to enj…