Mar 2 – 20, 2015
Nordita, Stockholm
Europe/Stockholm timezone

Searching for viable cosmological solutions in bigravity

Mar 18, 2015, 11:00 AM
132:028 (Nordita, Stockholm)


Nordita, Stockholm


Dr Frank KOENNIG (Institute for Theoretical Physics, University of Heidelberg)


I will discuss the constraints for the absence of gradient instabilities in the scalar sector and the Higuchi ghost. These will show that all infinite branches suffer from the Higuchi ghost at all times and provide a relation between ghost-like helicity-0 and helicity-2 dofs. Furthermore, I will briefly discuss "exotic" branches, like bouncings or asymptotic static universes, and comment on one promising way to solve the gradient instability problem in finite branches.

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