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

Two loop corrections

  1. Dec 16, 2007 #1
    I have been reading a Weinberg paper (the cosmological constant problem), where he writes

    "...Zeldovich assumed that these were cancelled leaving only the higher order effects: in particulal, the gravitational force between the particles in the vacuum fluctuations. (In Feynman diagram terms, this corresponds to throwing away te one-loop graphs, but keeping those with two loops"

    Can someone help me understand this. I thought QFT said nothing about gravity. Why do the two loops correspond to the gravitational force??
     
  2. jcsd
  3. Dec 18, 2007 #2
    anyone??

    :)
     
  4. Dec 18, 2007 #3

    Gokul43201

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You might have better luck if you cite the paper.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?