Hi all, Next week, our visitor, Leon Loveridge, will talk about “Quantum Reference Frames, Locality, and Microcausality in Quantum Field Theory”. See below for the abstract. The talk will take place on Monday at 15:30 in HIT E41.1. Best, Ladina %%%%%%%%%% Title: Quantum Reference Frames, Locality, and Microcausality in Quantum Field Theory Abstract: In this talk, I'll introduce the operational framework for quantum reference frames, and give an overview of the main ideas and some recent results. I'll then discuss the example of translation-covariant quantum reference frames in Minkowski space, where the spectrum condition prohibits ideality of the frame. We will see that for a large class of frame states, strict locality is replaced by almost locality, and microcausality by commutators that decay rapidly with increasing separation, corresponding to an effective smearing of the light cone by the localisation density of the frame state. I'll also discuss measurement disturbance and causality in this setting. Finally I'll discuss the upshot that quantum field theories formulated relative to a quantum reference frame cannot rest on the traditional axioms, which must be updated by taking into account physically realistic properties of the frame.