Thermodynamics and Lemaitre-Tolman-Bondi void models
  It has been argued in the literature that in order to make a matter dominated
Friedmann-Lemaitre-Robertson-Walker universe compatible with the generalized
second law of thermodynamics, one must invoke dark energy, or modified gravity.
In the present article we investigate if in a similar spirit, inhomogeneous
cosmological models can be motivated on thermodynamic grounds. We examine a
particular minimal void Lemaitre-Tolman-Bondi inhomogeneous model which agrees
well with observations. While on the one hand we find that the entropy
associated with the apparent horizon is not well-behaved thermodynamically, on
the other hand the canonical Weyl curvature entropy shows satisfactory
thermodynamic behavior. We suggest that evolution of canonical Weyl curvature
entropy might be a useful way to evaluate the thermodynamic viability of
inhomogeneous cosmologies.
