I will motivate the idea of quantum fields on a classical spacetime as a fundamental theory, giving rise to dynamics governed by the nonlinear Schrödinger-Newton equation in the nonrelativistic limit. I discuss the issue that arises from this nonlinear evolution regarding causality and how it may be avoided in a model that encompasses a mechanism for objective wave function collapse.
I will further discuss gravity-induced entanglement as a proxy for the quantisation of gravity, and argue that experimental tests of quantum versus semiclassical gravity through entanglement generation are strongly constrained by acceleration noise.
André Großardt (Jena): Classically gravitating quantum systems: causality, entanglement, and experimental tests
