  We present a brief review of the teleparallel equivalent of general
relativity and analyse the expression for the centre of mass density of the
gravitational field. This expression has not been sufficiently discussed in the
literature. One motivation for the present analysis is the investigation of the
localization of dark energy in the three-dimensional space, induced by a
cosmological constant in a simple Schwarzschild-de Sitter space-time. We also
investigate the gravitational centre of mass density in a particular model of
dark matter, in the space-time of a point massive particle and in an arbitrary
space-time with axial symmetry. The results are plausible, and lead to the
notion of gravitational centre of mass (COM) distribution function.
