1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Polymer random walk question

  1. May 15, 2009 #1
    I understand the mean square end-to-end distance of a polymer of stepsize b and number of units N is given by

    [tex]\left\langle R^{2}\right\rangle = \sum_{i,j=1}^{N} \left\langle r_{i} r_{j}\right\rangle + \left\langle \sum_{i \neq j}^{N} r_{i} r_{j}\right\rangle[/tex]

    And that the cross terms drop out to produce the solution of Nb^2. However I don't understand the origin of these cross terms in the first place - what do they physically represent? And how would one evaluate the sum in the cross terms??
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?



Similar Discussions: Polymer random walk question
  1. Physics Questions (Replies: 0)

  2. Redshift question (Replies: 0)

Loading...