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By Orchidea Maria Lecian, Giovanni Montani, O. M. Lecian and G. Montani


We will analyze two particular features of an exponential gravitational Lagrangian. On the one hand, while this choice of the Lagrangian density allows for two free parameters, only one scale, the cosmological constant, arises as fundamental when the proper Einsteinian limit is to be recovered. On the other hand, the vacuum energy arising from f(R) theories such that f(0) = 0 needs a cancellation mechanism, by which the present value of the cosmological constant can be recast

Topics: Canonical formalism, Lagrangians, and variational principles, Cosmology, Cosmological constant
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