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Homework Help: Gravitational lensing

  1. Apr 19, 2013 #1
    1. The problem statement, all variables and given/known data
    I'm studying about gravitational lensing and got stuck on an article:


    where the equation 2.1 is abit strange to me. The authour uses the reference


    for deriving the equation.

    According to me, the sum on equation is extremly similar to Gravitational Potential.

    2. Relevant equations

    Equation 1 has the form w = z - Ʃsigma/(bar(z)-bar(zj)) and the gravitational potential is given in http://en.wikipedia.org/wiki/Gravitational_potential as Ʃ-Gmi/(x-xi)

    3. The attempt at a solution
    I think that the complex sum in 2.1 is the same as gravitational potential.

    My question is if this is true? Or do I need to do some more research about the derivation?
  2. jcsd
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