Link to the Zoom: https://cesnet.zoom.us/j/91036534057
Abstract: Bimetric gravity, is a theory of gravity that posits the existence of two interacting and dynamical metric tensors. The spectrum of bimetric gravity consists of a massless and a massive spin-2 particle. The form of the interactions between the two metrics is constrained by requiring absence of the so called Boulware-Deser ghost. In this talk we will extend the original bimetric theory to its bimetric-affine counterpart, in which the two connections, associated with the Ricci scalars, are treated as independent variables. We will examine in detail the case of an additional quadratic in the Ricci scalar curvature term and we will prove that this theory is ghost-free for a wide range of the interaction parameters.
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