Novel aspects of C-theories in Cosmology
Koivisto, Tomi S. · Mota, David F. · Sandstad, Marit
Original · EN
The field equations in FRW background for the so called C-theories are presented and investigated. In these theories the usual Ricci scalar is substituted with f(R) where R is a Ricci scalar related to a conformally scaled metric gμν = C(R)gμν, where the conformal factor itself depends on R. It is shown that homogeneous perturbations of this Ricci scalar around general relativity FRW background of a large class of these theories are either inconsistent or unstable.
English translation
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