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Glimpse of Time Before Big Bang Possible

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  • derhexer@aol.com
    URL to an interesting article in SPACE.COM _http://www.space.com/scienceastronomy/070702_mm_big_bang.html_
    Message 1 of 1 , Jul 2, 2007
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      URL to an interesting article in SPACE.COM
      _http://www.space.com/scienceastronomy/070702_mm_big_bang.html_
      (http://www.space.com/scienceastronomy/070702_mm_big_bang.html)

      First few paragraphs
      " Glimpse of Time Before Big Bang Possible
      By _Charles Q. Choi_ (mailto:cqchoi@...)
      Special to LiveScience
      posted: 01 July 2007
      01:15 pm ET
      It may be possible to glimpse before the supposed beginning of time into the
      universe prior to the Big Bang, researchers now say.
      Unfortunately, any such picture will always be fuzzy at best due to a kind
      of "cosmic forgetfulness."
      The _Big Bang_
      (http://www.space.com/scienceastronomy/060911_mystery_monday.html) is often thought as the start of everything, including _time_
      (http://www.livescience.com/scienceoffiction/070307_time_travel.html) , making any
      questions about what happened during it or beforehand nonsensical. Recently
      scientists have instead suggested the Big Bang might have just been the explosive
      beginning of the current era of the universe, hinting at a mysterious past.
      To see how far into history one might gaze, theoretical physicist Martin
      Bojowald at Pennsylvania State University ran calculations based on loop quantum
      gravity, one of a number of competing theories seeking to explain how the
      underlying structure of the universe works.
      Past research suggested the Big Bang was preceded by infinite energies and
      _space-time warping_
      (http://www.space.com/php/video/player.php?video_id=black_holes) where existing scientific theories break down, making it impossible
      to peer beforehand. The new findings suggest that although the levels of
      energy and space-time warping before the Big Bang were both incredibly high, they
      were finite.
      Scientists could spot clues in the present day of what the cosmos looked
      like previously. If evidence of the past persisted after the Big Bang, its
      influence could be spotted in astronomical observations and computational models,
      Bojowald explained.
      However, Bojowald also figures some knowledge of the past was irrevocably
      lost. For instance, the sheer size of the present universe would suppress
      precise knowledge of how the universe changed in size before the Big Bang, he
      said.
      "It came as a big surprise that some properties of the universe before the
      Big Bang may have only such a weak influence on current observations that they
      are practically undetermined," Bojowald said of findings detailed online
      July 1 in the journal Nature Physics.
      One implication of this "cosmic forgetfulness," as Bojowald calls it, is
      that history does not repeat itself-the fundamental properties of the current
      era of the universe are different from the last, Bojowald explained. "It's as
      if the universe forgot some of its properties and acquired new properties
      independent of what it had before," he told SPACE.com."
      Chris



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