Testing Modified Dark Matter with Galaxy Clusters: Does Dark Matter know   about the Cosmological Constant?
  We discuss the possibility that the cold dark matter mass profiles contain information on the cosmological constant, and that such information constrains the nature of cold dark matter (CDM). We call this approach Modified Dark Matter (MDM). In particular, we examine the ability of MDM to explain the observed mass profiles of 13 galaxy clusters. Using general arguments from gravitational thermodynamics, we provide a theoretical justification for our MDM mass profile and successfully compare it to the NFW mass profiles both on cluster and galactic scales. Our results suggest that indeed the CDM mass profiles contain information about the cosmological constant in a non-trivial way. 
Doug Edmonds, Duncan Farrah, Chiu Man Ho, Djordje Minic, Y. Jack Ng,   and Tatsu Takeuchi
astro-ph.CO astro-ph.HE hep-ph