Accelerating Cosmology Driven by Gravitational Production of Dark Matter   Particles: Constraints from SNe Ia and H(z) data
  The free parameters of a flat accelerating model without dark energy are constrained by using Supernovae type Ia and observational H(z) data. Instead of the vacuum dominance, the present accelerating stage in this modified Einstein-de Sitter cosmology is a consequence of the gravitationally-induced particle production of cold dark matter. The model present a transition from a decelerating to an accelerating regime at low redshifts, and is also able to harmonize a cold dark matter picture with the latest measurements of the Hubble constant H_0, the Supernovae observations (Constitution sample), and the H(z) data. 
R. C. Santos, F. E. Silva, J. A. S. Lima
astro-ph.CO gr-qc