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We review how modular categories, and commutative and non-commutative Frobenius algebras arise in rational conformal field theory. For Euclidean CFT we use an approach based on sewing of surfaces, and in the Minkowskian case we describe CFT…

Mathematical Physics · Physics 2009-02-24 Liang Kong , Ingo Runkel

We use the embedding formalism to construct conformal fields in $D$ dimensions, by restricting Lorentz-invariant ensembles of homogeneous neural networks in $(D+2)$ dimensions to the projective null cone. Conformal correlators may be…

High Energy Physics - Theory · Physics 2025-10-07 James Halverson , Joydeep Naskar , Jiahua Tian

We extend to curved backgrounds all flat-space scalar field models that obey purely second-order equations, while maintaining their second-order dependence on both field and metric. This extension simultaneously restores to second order…

General Relativity and Quantum Cosmology · Physics 2009-10-07 C. Deffayet , S. Deser , G. Esposito-Farese

We formulate two-dimensional rational conformal field theory as a natural generalization of two-dimensional lattice topological field theory. To this end we lift various structures from complex vector spaces to modular tensor categories.…

High Energy Physics - Theory · Physics 2009-11-07 J. Fuchs , I. Runkel , C. Schweigert

We show how Boundary Conformal Field Theory deformation techniques allow for a complete characterisation of the coupling between the discrete geometry inherited uniformizing a random Regge triangulations and open string theory.

High Energy Physics - Theory · Physics 2007-05-23 Mauro Carfora , Claudio Dappiaggi , Valeria L. Gili

We give a classification of open Klein topological conformal field theories in terms of Calabi-Yau $A_\infty$-categories endowed with an involution. Given an open Klein topological conformal field theory, there is a universal open-closed…

Quantum Algebra · Mathematics 2016-04-26 Ramses Fernandez-Valencia

Every conformal field theory has the symmetry of taking each field to its adjoint. We consider here the quotient (orbifold) conformal field theory obtained by twisting with respect to this symmetry. A general method for computing such…

High Energy Physics - Theory · Physics 2013-11-01 Doron Gepner , Herve Partouche

We will show how the study of randomly triangulated surfaces merges with the study of open/closed string dualities. In particular we will discuss the Conformal Field Theory which arises in the open string sector and its implications.

High Energy Physics - Theory · Physics 2009-11-10 Mauro Carfora , Claudio Dappiaggi , Valeria Gili

Boundary conformal field theory (BCFT) is the study of conformal field theory (CFT) on manifolds with a boundary. We can use conformal symmetry to constrain correlation functions of conformal invariant fields. We compute two-point and…

High Energy Physics - Theory · Physics 2012-09-11 M. R. Setare , V. Kamali

Topological field theory in three dimensions provides a powerful tool to construct correlation functions and to describe boundary conditions in two-dimensional conformal field theories.

High Energy Physics - Theory · Physics 2007-05-23 J. Fuchs , I. Runkel , C. Schweigert

This is the seventh article in the collection of reviews "Exact results on N=2 supersymmetric gauge theories", ed. J.Teschner. It discusses an interesting class of observables localised on surfaces that attracts steadily growing attention.…

High Energy Physics - Theory · Physics 2014-12-23 Sergei Gukov

We analyse the fusion of representations of the triplet algebra, the maximally extended symmetry algebra of the Virasoro algebra at c=-2. It is shown that there exists a finite number of representations which are closed under fusion. These…

High Energy Physics - Theory · Physics 2009-10-30 Matthias R. Gaberdiel , Horst G. Kausch

This is a review of two-dimensional conformal field theory including some of the relations to integrable models. An effort is made to develop the basic formalism in a way which is as elementary and flexible as possible at the same time.…

High Energy Physics - Theory · Physics 2017-08-04 Joerg Teschner

We construct a large class of conformal interfaces between two-dimensional c=1 conformal field theories describing compact free bosons and their Z_2 orbifolds. The interfaces are obtained by constructing boundary states in the corresponding…

High Energy Physics - Theory · Physics 2017-10-09 Melanie Becker , Yaniel Cabrera , Daniel Robbins

A comprehensive introduction to two-dimensional conformal field theory is given.

High Energy Physics - Theory · Physics 2014-11-18 Matthias R Gaberdiel

We construct logarithmic conformal field theories starting from an ordinary conformal field theory -- with a chiral algebra C and the corresponding space of states V -- via a two-step construction: i) deforming the chiral algebra…

High Energy Physics - Theory · Physics 2009-11-07 J. Fjelstad , J. Fuchs , S. Hwang , A. M. Semikhatov , I. Yu. Tipunin

The implications of restricted conformal invariance under conformal transformations preserving a plane boundary are discussed for general dimensions $d$. Calculations of the universal function of a conformal invariant $\xi$ which appears in…

Condensed Matter · Physics 2009-10-28 D. M. McAvity , H. Osborn

Does a conformal manifold imply the existence of exactly marginal operators? We answer this question affirmatively under the assumption that there exists a conformal interface with certain properties connecting nearby CFTs. We show that the…

High Energy Physics - Theory · Physics 2026-01-13 Shota Komatsu , Yuya Kusuki , Marco Meineri , Hirosi Ooguri

The AdS/CFT correspondence is explored for ``partially massless'' fields in AdS space (which have fewer helicity states than a massive field but more than a conventional massless field). Such fields correspond in the boundary conformal…

High Energy Physics - Theory · Physics 2010-04-07 Louise Dolan , Chiara R. Nappi , Edward Witten

Parafermionic conformal field theories are considered on a purely algebraic basis. The generalized Jacobi type identity is presented. Systems of free fermions coupled to each other by nontrivial parafermionic type relations are studied in…

High Energy Physics - Theory · Physics 2010-10-27 Boris Noyvert