CARDONE V. F.

Quintessence issues can be achieved by taking into account higher order curvature invariants into the effective action of gravitational field. Such an approach is naturally related to fundamental theories of quantum gravity which predict higher order terms in loop expansion of quantum fields in curved space-times. In this framework, we obtain a...

Higher order curvature gravity has recently received a lot of attention since it gives rise to cosmological models which seem capable of solving dark energy and quintessence issues without using "ad hoc" scalar fields. Such an approach is naturally related to fundamental theories of quantum gravity which predict higher order terms for loop...

Higher order curvature gravity has recently received a lot of attention due to the fact that it gives rise to cosmological models which seem capable of solving dark energy and quintessence issues without using "ad hoc" scalar fields. In this Letter, a gravitational potential is obtained which differs from the Newtonian one because of a...

We discuss an alternative approach to quintessence, modifying the usual equation of state of the cosmological fluid in order to see whether going further than the approximation of perfect fluid allows one to better reproduce the available data. We consider a cosmological model comprising only two fluids, namely baryons (modelled as dust) and...