Jens Fjelstad

Articles in journals

• Fjelstad, J. & Fuchs, J. (2020). Mapping class group representations from Drinfeld doubles of finite groups. Journal of knot theory and its ramifications, 29 (5).
• Fjelstad, J. & Månsson, T. (2012). New symmetries of the chiral Potts model. Journal of Physics A: Mathematical and General, 45 (15).
• Fjelstad, J. , Fuchs, J. & Stigner, C. (2012). RCFT with defects: Factorization and fundamental world sheets. Nuclear Physics B, 863 (1), 213-259.
• Björnsson, J. & Fjelstad, J. (2011). Modular invariant partition functions for noncompact G/Ad(H) models. Physical Review D, 83 (8).
• Fjelstad, J. (2011). On duality and extended chiral symmetry in the SL(2,R) WZW model. Journal of Physics A: Mathematical and General, 44 (23).
• Andersen, J. E. & Fjelstad, J. (2010). Reducibility of quantum representations of mapping class groups. Letters in Mathematical Physics, 91 (3), 215-239.
• Chen, G. , Cheung, Y. E. , Fan, Z. , Fjelstad, J. & Hwang, S. (2009). No-ghost theorem for the bosonic Nappi-Witten string. Physical Review D, 80 (8).
• Fjelstad, J. , Fuchs, J. , Runkel, I. & Schweigert, C. (2008). Uniqueness of open/closed rational CFT with given algebra of open states. Advances in Theoretical and Mathematical Physics, 12 (6), 1283-1375.
• Fjelstad, J. , Fuchs, J. , Runkel, I. & Schweigert, C. (2006). TFT construction of RCFT correlators V: Proof of modular invariance and factorisation. Theory and Applications of Categories, 16 (16), 342-433.
• Fjelstad, J. , Hwang, S. & Månsson, T. (2002). CFT description of three-dimensional Kerr-de Sitter space-time. Nuclear Physics B, 641 (1-2), 376-392.
• Fjelstad, J. , Fuchs, J. , Hwang, S. , Semikhatov, A. M. & Tipunin, I. Y. (2002). Logarithmic conformal field theories via logarithmic deformations. Nuclear Physics B, 633 (3), 379-413.
• Fjelstad, J. & Hwang, S. (2002). Sectors of solutions in three-dimensional gravity and black holes. Nuclear Physics B, 628 (1-2), 331-360.
• Fjelstad, J. & Hwang, S. (1999). Equivalence of Chern-Simons gauge theory and WZNW model using a BRST symmetry. Physics Letters B, 466 (2-4), 227-233.

Chapters in books

• Runkel, I. , Fjelstad, J. , Fuchs, J. & Schweigert, C. (2007). Topological and conformal field theory as Frobenius algebras. In: Alexei Davydov, Michael Batanin, Michael Johnson, Stephen Lack and Amnon Neeman, Categories in Algebra, Geometry and Mathematical Physics (pp. 225-248). . American Mathematical Society (AMS).

Conference papers

• Fjelstad, J. , Fuchs, J. , Stigner, C. & Schweigert, C. (2012). Partition functions, mapping class groups and Drinfeld doubles. In:  Symmetries and Groups in Contemporary Physics Proceedings of the XXIX International Colloquium on Group-Theoretical Methods in PhysicsTianjin, China, 20 – 26 August 2012. Paper presented at The XXIX International Colloquium on Group-Theoretical Methods in Physics, Tianjin, China, August 20-26, 2012. (pp. 405-410). Shanghai: World Scientific.
• Andersen, J. E. & Fjelstad, J. (2010). On Reducibility of Mapping Class Group Representations: The SU(N) case. In: Stefaan Caenepeel, Jürgen Fuchs, Simone Gutt, Christophe Schweigert, Alexander Stolin, Freddy Van Oystaeyen,  Noncommutative structures in mathematics and physics. Paper presented at Noncommutative Structures in Mathematics and Physics, Brussels, Belgium, July 22-26, 2008. (pp. 27-45). Brussels: Koninklijke vlaamse academie van Belgie voor Wetenschappen en kunsten.

Doctoral theses, monographs

• Fjelstad, J. (2002). Conformal Field Theory and the Holgoraphic Principle. (Doctoral dissertation). Karlstad: Karlstad University Studies.

Manuscripts

• Fjelstad, J. On 7-D TFT and 6-D chiral CFT.
• Fjelstad, J. & Fuchs, J. Mapping class group representations from Drinfeld doubles of finite groups.

Reports

• Fjelstad, J. (2001). The Holographic Principle. Karlstad: Division for Engineering Sciences, Physics and Mathematics, Dep. of Physics, Karlstad Univ. (Karlstad University studies 2001:2).