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Abstract: We survey the landscape of $fR$ theories of gravity in their variousformulations, which have been used to model the cosmic acceleration asalternatives to dark energy and dark matter. Besides, we take into account theproblem of gravitational waves in such theories. We discuss some successes of$fR$-gravity where $fR$ is a generic function of Ricci scalar $R$,theoretical and experimental challenges that they face in order to satisfyminimal criteria for viability.



Autor: S. Capozziello, M. De Laurentis, V. Faraoni

Fuente: https://arxiv.org/







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