Don't worry, the paper discusses only the intersection of these topics, not the union.
We know that the universe is not homogeneous on small scales, and we know that such local inhomogeneities affect light propagation and hence distances which depend on angles, such as the luminosity distance. What does this mean for constraints on cosmological parameters derived from the m-z relation for type Ia supernovae? And, conversely, what does the fact that these constraints, when locally homogeneity is assumed, agree with other constraints mean for the nature of dark matter? Perhaps surprising is that the data indicate that the universe is homogeneous, even on small scales. This could come about in more than one way.
Some additional plots are available in a talk given in 2014.
The links below point to one file containing the complete text, all figures and tables etc.
As are most of my publications this is available in more than one form: