Recorded 12 April 2022. Stefan Teufel of Eberhard-Karls-Universität Tübingen, Mathematics, presents "Local response in bulk-gapped interacting systems" at IPAM's Model Reduction in Quantum Mechanics Workshop. Abstract: In my talk, I will first discuss effective descriptions from physics for the quantum Hall effect in the realistic setting of thin Hall bars. Then I recall recent results on the response of interacting fermion systems that are gapped in the bulk to local perturbations and place them in this context. This offers a somewhat different perspective on the problem than the standard one in mathematical physics, which focuses on quantised bulk and indices indices. Learn more online at: http://www.ipam.ucla.edu/programs/workshops/workshop-ii-model-reduction-in-quantum-mechanics/?tab=schedule