Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why do we need the inflaton to expland space-time?

  1. Jun 6, 2013 #1
    Hi all!
    Fields associated with a particle affect other particles and their fields and that's ok.
    But why would a particle affect the space-time (which is not a particle) making it expand?
    Thank you in advance!
     
  2. jcsd
  3. Jun 6, 2013 #2
    Energy/particle feilds have energy mass density. Density is equivelent to pressure.
     
  4. Jun 6, 2013 #3
    You mean through an equation of state?

    Also, although I know the Friedmann equations, it is not clear to me why the fluid pressure, should it be negative, would cause the space-time to expand faster.
     
  5. Jun 6, 2013 #4
    Essentially the ratio of actual density to critical density.
    https://www.physicsforums.com/showthread.php?t=694499

    this thread shows the math some of the math involved. Though it doesn't cover the equations of state as its a curvature article.

    Related articles can be found in the links in my signature

    gravity being assigned as positive pressure would need the cosmological constant to be negative pressure to have expansion.
     
    Last edited: Jun 6, 2013
  6. Jun 6, 2013 #5
    Thank you!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Why do we need the inflaton to expland space-time?
Loading...