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The Einstein static universe in Scalar-Fluid theories · Around

2015

The Einstein static universe in Scalar-Fluid theories

Boehmer, Christian G., Tamanini, Nicola, Wright, Matthew

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A new Lagrangian framework has recently been proposed to describe interactions between relativistic perfect fluids and scalar fields.

In this paper we investigate the Einstein static universe in this new class of theories, which have been named Scalar-Fluid theories.
The stability of the static solutions to both homogeneous and inhomogeneous perturbations is analysed deriving the relevant cosmological perturbation equations at the linear order.
We can find several configurations corresponding to an Einstein static universes which are stable against inhomogeneous perturbations, but unstable against homogeneous perturbations.

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