Gravitational entropy of black holes and wormholes
  Pure thermodynamical considerations to describe the entropic evolution of the
universe seem to violate the Second Law of Thermodynamics. This suggests that
the gravitational field itself has entropy. In this paper we expand recent work
done by Rudjord, Gr{\O}n and Sigbj{\O}rn where they suggested a method to
calculate the gravitational entropy in black holes based on the so-called `Weyl
curvature conjecture'. We study the formulation of an estimator for the
gravitational entropy of Reissner-Nordstr\"om, Kerr, Kerr-Newman black holes,
and a simple case of wormhole. We calculate in each case the entropy for both
horizons and the interior entropy density. Then, we analyse whether the
functions obtained have the expected behaviour for an appropriate description
of the gravitational entropy density.
