The Origin of The Universe and the Arrow of Time

Details The Origin of The Universe and the Arrow of Time The Origin of The Universe and the Arrow of Time

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.9401c&link_type=abstract

American Astronomical Society, AAS Meeting #212, #94.01; Bulletin of the American Astronomical Society, Vol. 40, p.270

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Over a century ago, Boltzmann and others provided a microscopic understanding for the tendency of entropy to increase. But this understanding relies ultimately on an empirical fact about cosmology: the early universe had a very low entropy. Why was it like that? Cosmologists aspire to provide a dynamical explanation for the observed state of the universe, but have had very little to say about the dramatic asymmetry between early times and late times. I will argue that the search for a natural explanation for the observed breakdown of time-reversal symmetry in cosmology leads us directly to interesting conclusions about inflation, quantum gravity, and the multiverse.

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