My Stacking and the triviality of invertible phases (with Sven Bachmann, Alan Getz, and Noami Wray) has been accepted for publication in Annales Henri Poincaré. In this paper, we rigorously study the stacking of topological phases, and in particular the corresponding categories of superselection sectors. Along the way, we show that a large class of models satisfies the so-called approximate split property. If in addition we assume that there are only countably many simple objects in the category of sectors, then every superselection is direct sum of countably many superselection sectors. This clarifies a technical issue that has often been ignored in the literature. This is the first paper of my student Naomi, so big congratulations to her in particular!
In other good news, from the 1st of August 2026 I have been promoted to Senior Lecturer.