Oscillatory Universe, dark energy and general relativity
  The concept of oscillatory Universe appears to be realistic and buried in the dynamic dark energy equation of state. We explore its evolutionary history under the frame work of general relativity. We observe that oscillations do not go unnoticed with such an equation of state and that their effects persist later on in cosmic evolution. The `classical' general relativity seems to retain the past history of oscillatory Universe in the form of increasing scale factor as the classical thermodynamics retains this history in the form of increasing cosmological entropy. 
Partha Pratim Ghosh, Saibal Ray, A. A. Usmani and Utpal Mukhopadhyay
physics.gen-ph