2009

Vacuum structure for scalar cosmological perturbations in Modified Gravity Models

De Felice, Antonio, Suyama, Teruaki

Understand

We have found for the general class of Modified Gravity Models f(R,G) a new instability which can arise in vacuum for the scalar modes of the cosmological perturbations if the background is not de Sitter.

In particular, the short-wavelength modes, if stable, in general have a group velocity which depends linearly in k, the wave number.
Therefore these modes will be in general superluminal.
We have also discussed the condition for which in general these scalar modes will be ghost-like.

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