What Happened Before The Big Bang?

.: This kind of stuff hurts my brain but absolutely fascinates me. From Penn State Live:

Penn State researchers look beyond birth of universe
Monday, May 22, 2006

University Park, Pa. — According to Einstein’s general theory of relativity, the Big Bang represents The Beginning, the grand event at which not only matter but space-time itself was born. While classical theories offer no clues about existence before that moment, a research team at Penn State has used quantum gravitational calculations to find threads that lead to an earlier time.

“General relativity can be used to describe the universe back to a point at which matter becomes so dense that its equations don’t hold up,” said Abhay Ashtekar, holder of the Eberly family chair in physics and director of the Institute for Gravitational Physics and Geometry at Penn State. “Beyond that point, we needed to apply quantum tools that were not available to Einstein.”

By combining quantum physics with general relativity, Ashtekar and two of his post-doctoral researchers, Tomasz Pawlowski and Parmpreet Singh, were able to develop a model that traces through the Big Bang to a shrinking universe that exhibits physics similar to ours.

In research reported in the current issue of Physical Review Letters, the team shows that, before the Big Bang, there was a contracting universe with space-time geometry that otherwise is similar to that of our current expanding universe. As gravitational forces pulled this previous universe inward, it reached a point at which the quantum properties of space-time cause gravity to become repulsive, rather than attractive.

The full press release is here.

.: Rehearsals for the Sunday night gig are going well, we should be able to crank out about 14-15 tunes, even if a couple of them are, like, 60 seconds long!

4 Responses to “What Happened Before The Big Bang?”

  1. Jason Says:

    The thought of pushing back through the singularity at time 0 (the moment of the big bang) has also intrigued me. I remember attending a session on this topic at a Relativity conference in ’77 and none of the attendees was very hopefull. Ashtekar’s work looks very promising – in particular the knowledge it may hold on conditions in the big crunch universe.

    However, from a philosophical or spritual perspective the new theory only raises new questions. Where did the big crunch universe come from – an earlier big bang universe ? Also what are te implications that our universe is open – it will just keep expanding until the average energy/mass content approaches zero. Is our universe the last in a possible infinite chain?

    ps When are you going to rant about the seaon finale of Lost?

  2. Thomas Wang Says:

    I bet there is a largest possible length scale, similar to the idea that there is a minimum length scale. When the universe expands to the largest scale, it just bounces back toward the big crunch.

  3. ken seto Says:

    What happen before the Big bang?
    The answer to this question is in the peper entitled “The Origin of the Universe as Interpreted by Model Mechanics” in my website.
    http://www,geocities.com/kn_seto/index.htm

  4. ken seto Says:

    Sorry the address for my website is wrong. It shoould be as follows:
    http://www.geocities.com/kn_seto/index.htm

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