From continuum to the lattice in conformal field theory

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• Ingo Runkel (Universität Hamburg)
• Tuesday 16 September 2025, 10:00-11:30
• Seminar Room 2, Newton Institute.

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BID - Quantum field theory with boundaries, impurities, and defects

When studying a 2d statistical system, one important question is to identify critical points and the corresponding universality class of critical behaviour, that is, the 2d conformal field theory which describes the statistical model at large length scales. In this talk, I would like to discuss (but not answer) the converse question: starting from a 2d CFT , is there a way to construct lattice models which recover the given CFT in the continuum limit? A particular focus will be topological symmetries of the CFT , as determined by topological line defects, and how they can be preserved when passing to the lattice model. This talk is based on joint work with Enrico Brehm.

This talk is part of the Isaac Newton Institute Seminar Series series.

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