In Search of Our Universe's Missing Mass & Energy
Dr. Dan Hooper, Fermilab
Friday, November 16, 2007
The twentieth century was astonishing in all regards, shaking the foundations of practically every aspect of human life
and thought, physics not least of all. Beginning with the publication of Albert Einstein's theory of relativity up
until the physics of the modern, much of what physicists have learned suggests that a huge amount of our Universe is
unseen -- that we live in a dark cosmos. In fact what we can see -- a book, a cat, or our planet -- makes up only 5%
of the Universe. The rest is totally invisible to us; its presence discernible only by the weak effects it has on
visible matter around it. This invisible stuff comes in two varieties -- dark matter and dark energy. One holds
the Universe together, while the other tears it apart. The make up of these forces has been a mystery but the
latest discoveries of experimental physics have brought us closer to that knowledge.
Dan Hooper is a Fellow in the theoretical astrophysics group at Fermilab. His research investigates dark matter,
supersymmetry, neutrinos, extra dimensions and cosmic rays.
His first book, Dark Cosmos, was published by Smithsonian/HarperCollins in 2006.