## Dr Sam T. CarrInstitut fur Theorie der Kondensierten MaterieUniversitat Karlsruhe Room: 10-08 Tel: ++49 721 608-7006 Email: carr@tkm.uni-karlsruhe.de |

This applet animates collisions of solitons in the classical sine-Gordon equation. It first prepares an initial state with two solitons, then follows their time evolution by numerical integration of the sine-Gordon differential equation. The parameters v1 and v2 are the initial rapidities (speeds) of the two solitons, which should be numbers between zero and one. Its fun to see the `Lorentz contraction' of the solitons as the rapidities get closer to one.