Abstract
We study the dynamics of a `composite' or `dressed'
quark in strongly-coupled large-Nc = 4 super-Yang-Mills, making use of the AdS/CFT
correspondence. We show that the standard string dynamics nicely captures the physics of the quark
and its surrounding non-Abelian field configuration, making it possible to derive a relativistic
equation of motion that incorporates the effects of radiation damping. From this equation one can
deduce a non-standard dispersion relation for the composite quark, as well as a Lorentz covariant
formula for its rate of radiation. We explore the consequences of the equation in a few simple
examples.