Cosmic Hysteresis
  Cosmological hysteresis, has interesting and vivid implications in the
scenario of a cyclic bouncy universe. This, purely thermodynamical in nature,
is caused by the asymmetry in the equation of state parameter during expansion
and contraction phase of the universe, due to the presence of a single scalar
field. When applied to variants of modified gravity models this phenomenon
leads to the increase in amplitude of the consecutive cycles of the universe,
provided we have physical mechanisms to make the universe bounce and
turnaround. This also shows that the conditions which creates a universe with
an ever increasing expansion, depend on the signature of $\oint pdV$ and on
model parameters.
