Seminar by Christiane Klein (University of Leipzig)

In order to study physical effects of quantum fields on curved spacetimes, one needs appropriate Hadamard states to describe the fields. In this talk, we present a rigorous construction, including the proof of the Hadamard property, of the Unruh state for the free scalar field on slowly rotating Kerr-de Sitter spacetimes. We demonstrate how this state can be used to compute the stress-energy tensor of the quantum field and present numerical results for the stress-tensor at the inner horizon.