Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1083..128n&link_type=abstract
GRAVITATION AND COSMOLOGY: Proceedings of the Third International Meeting on Gravitation and Cosmology. AIP Conference Proceedin
Other
Cosmology, Dark Matter, Higher-Dimensional Gravity And Other Theories Of Gravity
Scientific paper
One of the biggest challenges for current cosmology is the late time speed-up of the universe. Among the several mechanisms that have been suggested to explain this problem we focus our attention in a model including both a negative cosmological constant Λ and a scalar field evolving under the action of an exponential potential. We conclude that a negative Λ is indeed allowed and could represent a viable mechanism to halt eternal acceleration. We reconstruct the gravity Lagrangian f(R) of a fourth order theory of gravity predicting the same dynamics (scale factor and Hubble parameter) as the starting model. We thus end up with a f(R) theory able to both fit the data and solve the problem of eternal acceleration without the need of an unusual negative Λ and ad hoc scalar fields.
Cardenas Rolando P.
Cardone Vincenzo Fabrizio
Nodal Yoelsy Leyva
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