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!

String theory question

  1. Sep 20, 2007 #1
    1. The problem statement, all variables and given/known data
    For problem 6.5 I did a lot of manipulation and I get that the following holds at the endpoints of an open string:

    [tex]c = |\frac{\partial{\vec{X}}}{\partial{t}}| [/tex]

    This probably seems like silly intuitive queston, but I cannot explain why this implies that the string endpoints move at the speed of light. Since X is a four-vector not a three-vector, why can we draw that conclusion?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?

Similar Discussions: String theory question
  1. Easy question (Replies: 0)

  2. Fridge Question (Replies: 0)