Non-Gaussianity Generated by the Entropic Mechanism in Bouncing
  Cosmologies Made Simple
  Non-gaussianity in the microwave background radiation is bound to play a key
role in giving us clues about the physics of the very early universe. However,
the associated calculations, at second and even third order in perturbation
theory, tend to be complicated to the point of obscuring simple underlying
physical processes. In this note, we present a simple analytic procedure for
approximating the non-linearity parameters f_{NL} and g_{NL} for cyclic models
in which the cosmological perturbations are generated via the entropic
mechanism. Our approach is quick, physically transparent and agrees well with
the results of numerical calculations.
