What happens when these two strings collide? Do they cancel each other out, pass through each other or interact in some way?


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  • $\begingroup$ They are attached at the ends? $\endgroup$ – Mitchell Porter Mar 27 '19 at 22:58
  • $\begingroup$ Yes they are attached at the ends $\endgroup$ – geocalc33 Mar 27 '19 at 23:04
  • 1
    $\begingroup$ The only way I can see to realize this scenario in string theory, is to have two D0-branes (0-dimensional branes, point-branes), and then have two strings stretching between them. So the strings aren't directly attached to each other, but rather they are both anchored to the same pointlike D-branes... Is this definitely the scenario you want analyzed? $\endgroup$ – Mitchell Porter Mar 27 '19 at 23:16
  • $\begingroup$ Yeah this is the scenario I want analyzed $\endgroup$ – geocalc33 Mar 27 '19 at 23:48

If two strings touch at a point, they can interact by recombining:

enter image description here

That is, if the midpoints of your two strings come into contact, the four "half-strings" can pair up differently, and then go their separate ways as two new strings.

(In the upper right picture, the green string is not broken, it's just "behind" the blue string.)


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