Accelerating anisotropic cosmologies in Brans-Dicke gravity coupled to a
  mass-varying vector field
  The field equations of Brans-Dicke gravity coupled to a mass-varying vector
field are derived. Anisotropic cosmological solutions with a locally
rotationally symmetric Bianchi type I metric and time-dependent scalar and
electric vector fields are studied. A particular class of exact solutions for
which all the variable parameters have a power-law time dependence is given.
The universe expands with a constant expansion anisotropy within this class of
solutions. We show that the accelerating expansion is driven by the scalar
field and the electric vector field can be interpreted as an anisotropic dark
matter source.
