  In the general relativity theory the basic ingredient to describe gravity is
the geometry, which interacts with all forms of matter and energy, and as such,
the metric could be interpreted as a true physical quantity. However the metric
is not matter nor energy, but instead it is a new dynamical variable that
Einstein introduced to describe gravity. In order to conciliate this approach
to the more traditional ones, physicists have tried to describe the main ideas
of GR in terms of standard conceptions of field theory. In this sense, curved
metrics are seen as a dynamical variable emerging from a more fundamental field
which lies upon a flat Minkowski spacetime. This was made by the hypothesis
that the metric tensor may be written as $g_{\mu\nu} = \eta_{\mu\nu} +
h_{\mu\nu}$ where the tensor $ h_{\mu\nu}$ was interpreted either in terms of a
spin-2 or constructed in terms of other fields. We review some proposals that
were suggested in the treatment of gravity in terms of scalar, spinor and
tensor fields configurations.
