Horizon - What Happened Before the Big Bang - [2010-10-11]
They are the biggest questions that science can possibly ask: where did everything in our universe come from? How did it all begin? For nearly a hundred years, we thought we had the answer: a big bang some 14 billion years ago. But now some scientists believe that was not really the beginning. Our universe may have had a life before this violent moment of creation. Horizon takes the ultimate trip into the unknown, to explore a dizzying world of cosmic bounces, rips and multiple universes, and finds out what happened before the big bang.
Precise modern models of the Big Bang appeal to various exotic physical
phenomena that have not been observed in terrestrial laboratory
experiments or incorporated into the Standard Model of particle physics. Of these features, dark matter is currently the subject to the most active laboratory investigations. Remaining issues, such as the cuspy halo problem and the dwarf galaxy problem of cold dark matter,
are not fatal to the dark matter explanation as solutions to such
problems exist which involve only further refinements of the theory. Dark energy
is also an area of intense interest for scientists, but it is not clear
whether direct detection of dark energy will be possible.