65-401:  Hopf algebras, quantum groups and topological field theory Lecturer: Christoph Schweigert Exercises: Christoph Schweigert Contents: 1. Hopf algebras and their representation categories 2. Finite-dimensional Hopf algebras 3. Quasi-triangular Hopf algebras and braided categories 4. Topological field theories and quantum codes Aim: We present an introduction to Hopf algebras over a field and their applications to topological field theories. The study of Hopf algebras (sometimes also known as quantum groups) is a very active field, relating algebra, representation theory and mathematical physics. Hopf algebras and topological field theories have applications in representation theory, topology, string theory, quantum gravity and quantum information theory. Special emphasis in this class will be on complex finite-dimensional Hopf algebras: their structure theory, examples and their representation categories. As an application, we present two constructions of topological field theories: the Turaev-Viro construction with applications in the theory of quantum codes and the Reshetikhin-Turaev construction (which describes generalizations of Chern-Simons theories) with applications in the construction of invariants for knots and three-dimensional manifolds. For more information refer to: https://christophschweigert.github.io/ss25/hopf.html Prerequisites: This lecture aims at students in the master programs of mathematics, mathematical physics and physics. It is accessible to motivated bachelor students as well. Prerequisites are a good knowledge of linear algebra (in particular vector spaces, their duals, linear maps, bilinear maps and tensor products). Some notions from algebra (in particular about groups and algebras) or the theory of Lie algebras are helpful, but not indispensable. Exam: oral Literature: S. Dascalescu, C. Nastasescu, S. Raianu, Hopf Algebras. An Introduction. Monographs and Textbooks in Pure and Applied Mathematics 235, Marcel-Dekker, New-York, 2001. C. Kassel, Quantum Groups, Graduate Texts in Mathematics 155, Springer, Berlin, 1995. C. Kassel, M. Rosso, Vl. Turaev: Quantum groups and knot invariants. Panoramas et Synthèses, Soc. Math. de France, Paris, 1993 S. Montgomery, Hopf algebras and their actions on rings, CMBS Reg. Conf. Ser. In Math. 82, Am. Math. Soc., Providence, 1993. Hans-Jürgen Schneider, Lectures on Hopf algebras, Notes by Sonia Natale. Trabajos de Matemática 31/95, FaMAF, 1995. Lecture notes: as a pdf file. Problem sheets: will be provided on STiNE. Please register in STiNE. Time and Place: See information in STiNE. Lectures start on Monday, April 7, 2025, tutorials on change! Monday, April 14 and Wednesday April 16, 2025.