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

Help! How to get green function of Bessel's differential equation?

  1. Feb 23, 2010 #1
    In my project, we enconter such kind of bessel's differential equation with stochastic source, like


    where we use prime to denote the derivative with [tex]\tau[/tex], [tex]\nu[/tex]
    and [tex]\lambda[/tex] are real constant parameter.

    how to get the green function of bessel's differential equation?
  2. jcsd
  3. Feb 24, 2010 #2
    I do not think that you need the Green function to solve your problem.

    If you can solve homogeneous linear DE, then you can easily write out the general solution to the corresponding non-homogeneous linear DE (see http://arxiv.org/abs/math-ph/0409035" [Broken]).

    In your case

    [tex]\Phi(\tau) = \tau^{-\nu}J_\nu}(k\tau)\,C1+\tau^{-\nu}Y_\nu(k\tau)\,C2-\frac{1}{2}\tau^{-\nu}\pi\lambda[\int\,-\tau^{\nu+1}J_\nu(k\tau)\psi(\tau)\,d\tau\,Y_\nu(k\tau)+\int\,\tau^{\nu+1}Y_\nu(k\tau)\psi(\tau)\,d\tau\,J_\nu(k\tau)][/tex]

    If you nevertheless do like the Green function, substitute [tex]\psi(\tau)=\delta(\tau-\tau_0)[/tex] to the above expression.
    Last edited by a moderator: May 4, 2017
  4. Feb 24, 2010 #3
    Thanks! You are master!
    Last edited by a moderator: May 4, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook