A Lagrangian description of interacting dark energy

Details A Lagrangian description of interacting dark energy A Lagrangian description of interacting dark energy

2006-08-07

arxiv.org/abs/gr-qc/0608031v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages; corrected errors, added comments

Scientific paper

We propose a relativistically covariant model of interacting dark energy based on the principle of least action. The cosmological term $\Lambda$ in the gravitational Lagrangian is a function of the trace of the energy--momentum tensor $T$. We find that the $\Lambda(T)$ gravity is more general than the Palatini $f(R)$ gravity, and reduces to the latter if we neglect the pressure of matter. We show that recent cosmological data favor a variable cosmological constant and are consistent with the $\Lambda(T)$ gravity, without knowing the specific function $\Lambda(T)$.

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