Dark matter: the top of the iceberg?
  We argue in favor of the existence of the LIPs, the least interacting particles, which would only interact with ordinary matter through gravitational field and could account for (at least) part of the dark matter. The detectability of LIP matter is addressed at the end. 
G. E. A. Matsas, J. C. Montero, V. Pleitez and D. A. T. Vanzella