2009/06/11 by Roberto Dale, Dale, R., Juan Antonío Morales-Lladosa +3
Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #History and Developments in Astronomy #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.0906.2085
openalex publication_date 2009/06/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We work in the framework of a simple vector-tensor theory. The parametrized post-Newtonian approximation of this theory is identical to that of general relativity. Our attention is focused on cosmology. In an homogeneous isotropic universe, it is proved that the energy density, ρA, of the vector field A, and its pressure, pA, do not depend on time, and also that the equation of state is ρA = -pA. This means that, in the theory under consideration, there is a cosmological constant, which is not vacuum energy, but the dark energy of the cosmic vector field A, whose evolution is classical.