Exponential Lagrangian for the Gravitational Field and the problem of Vacuum Energy

Details Exponential Lagrangian for the Gravitational Field and the problem of Vacuum Energy Exponential Lagrangian for the Gravitational Field and the problem of Vacuum Energy

2008-03-11

arxiv.org/abs/0803.1620v1

Int.J.Mod.Phys.A23:1286-1289,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, to appear in Proceedings of the II Stueckelberg Workshop - Int. J. Mod. Phys. A

Scientific paper

10.1142/S0217751X0804024X

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 $f(0)\neq 0$ needs a cancellation mechanism, by which the present value of the cosmological constant can be recast.

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