dark matter halos

The only research I did on my week-long vacation off the grid was to draft a section for Peebles's and my synthesis of galaxy evolution in the cold-dark-matter paradigm. The section I drafted was on the predictions and observations of the dark-matter halos (or concentrations, virialized or otherwise) around galaxies and groups of galaxies. I think that weak and strong lensing, along with sensitive measurements of intragroup light, might put serious constraints on the cold dark matter model at small scales, because, depending on some issues of how baryons populate the halos, each of these provides some handle on the distribution of dark matter—radial distribution, large-scale anisotropy, and small-scale substructure—which is (apparently) a robust prediction of the model.