On the Energy and Entropy of Surface Defects

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• Yang Zhou (Fudan University)
• Tuesday 09 December 2025, 14:00-15:00
• Seminar Room 1, Newton Institute.

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BIDW03 - The Many Faces of Boundaries, Impurities, and Defects

Surface defects provide a powerful window into strongly coupled quantum field theories. In this talk, I will present closed-form results for how surface defects contribute to the energy and entropy in six-dimensional theories. First, the defect contribution to twisted Rényi entropy takes a remarkably simple form: it is linear in 1/n where n is Rényi index, and controlled entirely by the defect Weyl-anomaly coefficients. I will also describe an equally compact expression for the defect contribution to the supersymmetric Casimir energy, which reduces to the known formula in the chiral-algebra limit. These results highlight a precise bridge between defect conformal anomalies and defect observables relevant to entanglement and Casimir energy.

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

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