qzzq- please note the links I provided.<br /><br />Those deal with the actual math related to actually observed quantum fluctuations. Granted, much of the quantum stuff is theory, but some is actual observed fact.<br /><br />Whether one believes in chance, and hence pure probability, or one believes in Intelligent design, for example: Creation, the math is still relevant and real.<br />Friction?<br /><br />My theoretical model predicts acceleration of expansion.<br /><br />If our universe is expanding closer to the matter contained in the much larger universe containing our universe and other universes (not zillions or infinite, btw), then that matter will have increasing gravitational influence on the matter in our universe, thus causing acceleration.<br /><br />[Edit: that matter would lie in all directions nearly uniformly on average - compare the CMBR (cosmic microwave background radiation - nearly uniform, but not quite. Note that the CMBR we observe is ancient; the possible current interactions even if as close a 5 billion light years from us would not be observed by us for billions of years! Unless some forms of observable (pending scientific advances in observation methods) energy are FTL (= Faster than light)]<br /><br />Granted, I thought up that model on my own.<br /><br />Nevertheless, there are other models that explain the acceleration as independent of gravity - involving some form of invisible energy causing acceleration.<br /><br />Note that the definition of spirit in Hebrew and Greek basically means invisible energy.<br />Therefore the current popular dark energy models are in harmony with the model in Isaiah 40:22. <br /><br />Suffice it to say: there is no proof that acceleration of expansion is solely caused from within our universe, i.e., there is no proof our universe is a closed system, theromodynamically speaking. (Please do not confuse the term "closed" in reference to whether our unviverse will expand eternally or not - I am speaking of thermodynamics,