What Happened Before the Big Bang?
Summary
This episode explores the physics of cosmic inflation, explaining how a scalar inflaton field drove exponential expansion and likely never fully stopped. The host details how quantum fluctuations in this field create a fractal structure of eternally inflating space interspersed with "bubble universes," including our own. The discussion covers the transition from old to slow-roll inflation, the evidence found in cosmic microwave background fluctuations, and the speculative nature of the underlying grand unified theories.
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