V. Tapia et M. Ujevic, UNIVERSAL FIELD-EQUATIONS FOR METRIC-AFFINE THEORIES OF GRAVITY, Classical and quantum gravity (Print), 15(11), 1998, pp. 3719-3729
We show that almost all metric-affine theories of gravity yield Einste
in field equations with a non-null cosmological constant Lambda. Under
certain circumstances and for any dimension, it is also possible to i
ncorporate a Weyl vector field W-mu and therefore the presence of an a
nisotropy. The viability of these field equations is discussed in view
of recent astrophysical observations.