Another stab at: What came before the Big Bang? = We all hates the Big Bang.
Working with Alan Guth, a pioneering cosmologist at the Massachusetts Institute of Technology, Carroll has developed a not-yet-published theory called Two-Headed Time. In this model of the universe, time has existed forever. But unlike the static cosmos imagined by Aristotle and Newton and Einstein, this universe changes as the eons go by. The evolution of the cosmos is symmetric in time, such that the behavior of the universe before the Big Bang is nearly a mirror image of its behavior after. Until 14 billion years ago, the universe was contracting. It reached a minimum size at the Big Bang (which we call t = 0) and has been expanding ever since. (Other quantum cosmologists have proposed similar models.) It’s like a Slinky that falls to the floor, reaches maximum compression on impact, and then bounces back to larger dimensions. Because of the unavoidable random fluctuations required by quantum physics, the contracting universe would not be an exact mirror image of the expanding universe; a physicist named Alan Guth probably did not exist in the contracting phase of our universe.
It is well known in the science of order and disorder that, other things being equal, larger spaces allow for more disorder, essentially because there are more places to scatter things. Smaller spaces therefore tend to have more order. As a consequence, in the Carroll–Guth picture, the order of the universe was at a maximum at the Big Bang; disorder increased both before and after. Recall that the forward direction of time is determined by the movement of order to disorder. Thus the future points away from the Big Bang in two directions. A person living in the contracting phase of the universe sees the Big Bang in her past, just as we do. When she dies, the universe is larger than when she was born, just as it will be for us. “When I came to understand that the reason I can remember the past but not the future is ultimately related to conditions at the Big Bang, that was a startling epiphany,” said Carroll. More.
Carroll’s ideas are interesting but — as noted earlier in this space — a mystic could have thunk it up on a meditation mat millennia ago. What makes this science?
See also: Big Bang exterminator wanted, will train
Cosmologist Sean Carroll would retire falsifiability as a science idea. Philosopher Massimo Pigliucci defends it.
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