  We consider the behavior of open strings on AdS wormholes in Gauss-Bonnet
theory, which are the Gauss-Bonnet gravity duals of a pair of field theories. A
string with both endpoints on the same side of the wormhole describes two
charges within the same field theory, which exhibit Coulomb interaction for
small separation. On the other hand, a string extending through the wormhole
describes two charges which live in different field theories, and they exhibit
a spring-like confining potential. A transition occurs when there is a pair of
charges present within each field theory: for small separation each pair of
charges exhibits Coulomb interaction, while for large separation the charges in
the different field theories pair up and exhibit confinement. If two charges
move faster than a critical speed, then they exhibit a separation gap and
energy is transferred from the leading charge to the lagging one.
