Notices
Results 1 to 5 of 5

Thread: inflation and speed of light

  1. #1 inflation and speed of light 
    WYSIWYG Moderator marnixR's Avatar
    Join Date
    Apr 2007
    Location
    Cardiff, Wales
    Posts
    5,810
    maybe something that's been discussed before, in which case i've missed it, but why was the 450,000 year old universe 18 million lightyears across ? i understand that it has something to do with the inflationary period about 10E-35 seconds after the big bang, but if nothing can go faster than the speed of light, how can the boundary of the universe go faster ? or did the limitation on the speed of light not exist until the decoupling of matter and radiation ?


    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Ph.D. Cat1981(England)'s Avatar
    Join Date
    Sep 2006
    Location
    South Downs.
    Posts
    913
    Quote Originally Posted by Wikipedia-Inflationary epoch
    In physical cosmology the inflationary epoch was the period in the evolution of the early universe when, according to inflation theory, the universe underwent an extremely rapid exponential expansion. This rapid expansion increased the linear dimensions of the early universe by a factor of at least 10^26 (and possibly a much larger factor), and so increased its volume by a factor of at least 10^78.

    The expansion is thought to have been triggered by the phase transition that marked the end of the preceding grand unification epoch at approximately 10-35 seconds after the Big Bang. One of the theoretical products of this phase transition was a scalar field called the inflaton field. As this field settled into its lowest energy state throughout the universe, it generated a repulsive force that led to a rapid expansion of the fabric of space-time. This expansion explains various properties of the current universe that are difficult to account for without such an inflationary epoch.

    It is not known exactly when the inflationary epoch ended, but it is thought to have been between 10-33 and 10-32 seconds after the Big Bang. The rapid expansion of space meant that elementary particles remaining from the grand unification epoch were now distributed very thinly across the universe. However, the huge potential energy of the inflaton field was released at the end of the inflationary epoch, repopulating the universe with a dense, hot mixture of quarks, anti-quarks and gluons as it entered the electroweak epoch.
    Link.

    ---------------

    I'm pretty sure there was an experiment not so long ago in which they managed to push a particle faster than the speed of light, i'll see if i can find a link.

    ----Edit---- Here's the faster than light link.


    Eat Dolphin, save the Tuna!!!!
    Reply With Quote  
     

  4. #3  
    WYSIWYG Moderator marnixR's Avatar
    Join Date
    Apr 2007
    Location
    Cardiff, Wales
    Posts
    5,810
    so if i understand it correctly, it's only energy and matter that is subject to einstein's limitations, not the fabric of the universe ?

    meaning that if the universe can grow faster than the speed of light, there's still some outlying portions of the universe of which light hasn't reached us yet
    "Reality is that which, when you stop believing in it, doesn't go away." (Philip K. Dick)
    Reply With Quote  
     

  5. #4  
    Forum Ph.D. Cat1981(England)'s Avatar
    Join Date
    Sep 2006
    Location
    South Downs.
    Posts
    913
    This is probably a better explanation.....
    In the corresponding theory of inflation, the Universe, because of properties of elementary particles not accounted for in the standard big bang models, expands for a fleeting instant at its beginning at a much higher rate than that expected for the big bang. This period, which is called the inflationary epoch, is a consequence of the nuclear force breaking away from the weak and electromagnetic forces that it was unified with at higher temperatures in what is called a phase transition. (An example from everyday life of a phase transition is the conversion of ice to liquid water.)
    This phase transition is thought to have happened about 10-35 seconds after the creation of the Universe. It filled the Universe with a kind of energy called the vacuum energy, and as a consequence of this vacuum energy density (which plays the role of an effective cosmological constant), gravitation effectively became repulsive for a period of about 10-32 seconds. During this period the Universe expanded at an astonishing rate, increasing its size scale by about a factor of 10^50. Then, when the phase transition was complete the universe settled down into the big bang evolution that we have discussed prior to this point. This, for example, means that the entire volume of the Universe that we have been able to see so far (out to a distance of about 18 billion light years) expanded from a volume that was only a few centimeters across when inflation began!
    Link

    I don't think that many of our current laws were in existence during the early stages of the universe, and came about after this period of expansion or were briefly ignored because of the exceptional circumstances. As for whether there is a void between the edge of the universe and the farthest light, i have no idea, but i would presume so.
    Eat Dolphin, save the Tuna!!!!
    Reply With Quote  
     

  6. #5  
    Forum Junior Twaaannnggg's Avatar
    Join Date
    May 2007
    Posts
    248
    Space itself is - as far as I understand it - not subject to the FTL-limitation.
    This gave rise to the specultaion wether there might be a way around that nasty speed limit, you know...going to Alpha Centauri within an afternoon. Shit out of luck.......does not work this way. The information between a vessel and the space (meaning also all possible means of manipulating said space - somewhat like a surfer riding on the wave of the sea, same for the spaceship surfing the ripple of space time without moving himself) can only move with the speed of light so...........
    Build a man a fire and he will be warm for a day, set a man on fire and he will be warm for the rest of his life.
    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •