This talk introduces the research foundations of WG3, which focuses on the theoretical development of gravitational interactions in quantum systems within the low-energy regime. We explore foundational questions about the nature of gravity and the role of observers, with an emphasis on identifying experimentally testable phenomena. Topics include quantum clocks, quantum reference frames,...
I offer a perspective on some research directions relevant for the COST Action, including IR/UV mixing, quantum-gravity-induced decoherence, spacetime fuzziness, quantum reference frames and the laws of particle propagation in a quantum spacetime. I also highlight two opportunities for phenomenology: the mystery concerning the origin of the KM3-230213A neutrino and the Caesium-Rubidium...
Status report of WG6 "Dissemination and Diversity" activities and future prospects.
