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

2 Ps

  1. Sep 14, 2003 #1

    wolram

    User Avatar
    Gold Member

    edit.
    if space is expanding how can the electrical properties
    stay constant?
     
    Last edited: Sep 14, 2003
  2. jcsd
  3. Sep 14, 2003 #2

    russ_watters

    User Avatar

    Staff: Mentor

    Are they?
     
  4. Sep 15, 2003 #3
    It is believed that the fine stucture constant is not a constant. That is, it changes over time. This is not firmly established but there are some good indications (i.e. experimental data). Why would that interest me, you wonder?
    Well the fine structure constant depends on 4 other constants:
    - e: electrical charge
    - c: speed of light
    - h: Planck's cst
    - e0: permittivity of space

    [alpha]=e2/2e0hc

    So if the fine stucture cst changes over time, one or more of these "constants" has to change. Since it is probably the permittivity of space that changes your question would be answered: they don't...
     
  5. Sep 15, 2003 #4

    wolram

    User Avatar
    Gold Member

    then i must be confused ,i thought that the 2Ps, governed
    the speed of light ,if one of them is changeing how
    can C be constant?
     
  6. Sep 16, 2003 #5
    Like I said: this is not firmly established. There are also (Australian) experiments suggesting that the speed of light is not constant in time, but in fact slowly decreasing (or was it increasing). The problem is that there are no checks for these experiments yet.
     
  7. Sep 16, 2003 #6

    wolram

    User Avatar
    Gold Member

    thankyou HEUMPJE
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: 2 Ps
  1. 2 Q's (Replies: 1)

  2. 2 questions (Replies: 9)

  3. 2 questions (Replies: 2)

  4. 2 cars (Replies: 12)

Loading...