A wide range of empirical evidence supports the notion that the universe has been expanding and cooling for the last 14 billion years. However, the idea that it began with a bang is pure speculation based on extrapolating back in time, assuming equations remain valid under conditions far beyond where they have been tested. In this talk, Paul Steinhardt will explain why it may be time to jettison the Big Bang. Namely, a series of recent advances strongly suggest that the only way to describe the remarkable homogeneity and isotropy observed on large scales may be if the universe first underwent a period of ultra-slow contraction. In that case, it is essential to replace the bang with a ‘bounce’ — a smooth transition from contraction to a dense, hot universe that proceeds to expand and cool. Among possible implications is a novel kind of cyclic theory of cosmic evolution.
Steinhardt is the Albert Einstein Professor in Science at Princeton University. He received his B.S. in physics from Caltech and his Ph.D. from Harvard University. He was a physics professor at the University of Pennsylvania from 1981 until 1998, when he joined the physics and astrophysics departments at Princeton. His research spans diverse fields, including cosmology, high-energy physics, condensed matter physics and geoscience. He is a fellow of the American Physical Society and the National Academy of Sciences.
4:45 - 5:00 PM ET Webinar waiting room opens
5:00 - 6:15 PM ET Talk + Q&A
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