2006/08/07 by Nikodem J. Popławski, Nikodem J. Poplawski, Poplawski, Nikodem J. · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Physics - Theory (hep-th) #Solar and Space Plasma Dynamics #astro-ph #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.gr-qc/0608031
14 pages; corrected errors, added comments
openalex publication_date 2006/08/07 · arxiv created 2006/09/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose a relativistically covariant model of interacting dark energy based on the principle of least action. The cosmological term Λ in the gravitational Lagrangian is a function of the trace of the energy--momentum tensor T. We find that the Λ(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 Λ(T) gravity, without knowing the specific function Λ(T).