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Latham Boyle (Perimeter)

Date: Tue. April 11th, 2023, 11:30 am-12:30 pm
Location: Foldy Room, Rockefeller 221

What is the simplicity of the early universe trying to tell us?
 
After reviewing some key hints and puzzles from the early
universe, I will introduce recent joint work with Neil Turok
suggesting a rigid and predictive new approach to addressing them.

Our universe seems to be dominated by radiation at early times, and
positive vacuum energy at late times.  Taking the symmetry and
analyticity properties of such a spacetime seriously leads to a new
formula for the gravitational entropy of our universe, and a picture
in which the Big Bang may be regarded as a kind of mirror.

I will explain how this line of thought suggests new explanations for
a number of observed properties of the universe, including: its
homogeneity, isotropy and flatness; the arrow of time (i.e. the fact
that entropy increases *away* from the bang); several properties of
the primordial perturbations; the nature of dark matter (which, in
this picture, is a right-handed neutrino, radiated from the early
universe like Hawking radiation from a black hole); the origin of the
primordial perturbations; and even the existence of three generations
of standard model fermions.  I will discuss some observational
predictions that will be tested in the coming decade, and some key
open questions.

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