Interacting Holographic Dark Energy Model as a Dynamical system and the   Coincidence Problem
  We examine the evolution of a holographic cosmological model with future event horizon as the infrared cut-off and dark matter and dark energy do not evolve independently $-$ there is interaction between them. The basic evolution equations are reduced to an autonomous system and corresponding phase space is analyzed. 
Ritabrata Biswas, Nairwita Mazumder, Subenoy Chakraborty
gr-qc