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Conditions for the cosmological viability of f(R) dark energy models
Luca Amendola, Radouane Gannouji, David Polarski +1
We derive the conditions under which dark energy models whose Lagrangian densities f are written in terms of the Ricci scalar R are cosmologically viable. We show that the cosmolog…
SNLS data are consistent with acceleration at z=3
Luca Amendola, M. Gasperini, Federico Piazza
We point out that the Type Ia supernovae in the SNLS dataset are consistent with an early beginning of the cosmic acceleration if dark energy interacts strongly with dark matter. W…
Challenges for scaling cosmologies
Luca Amendola, Miguel Quartin, Shinji Tsujikawa +1
A cosmological model that aims at solving the coincidence problem should show that dark energy and dark matter follow the same scaling solution from some time onward. At the same t…
Power-laws f(R) theories are cosmologically unacceptable
Luca Amendola, David Polarski, Shinji Tsujikawa
In a recent paper [1] (PRL 98,131302,2007) we have shown that f(R)=R + mu R^{n} modified gravity dark energy models are not cosmologically viable because during the matter era that…
Is it possible to observationally distinguish adiabatic Quartessence from LambdaCDM?
L. Amendola, M. Makler, R. R. R. Reis +1
The equation of state (EOS) in quartessence models interpolates between two stages: at high energy densities and at small ones. In the quartessence models…
Are f(R) dark energy models cosmologically viable ?
Luca Amendola, David Polarski, Shinji Tsujikawa
All modified gravity theories are conformally identical to models of quintessence in which matter is coupled to dark energy with a strong coupling. This coupling induces a c…