  We study the bifurcations of a special case of the Kuramoto model with two
communities of oscillators and an external drive. We use Ott-Antonsens ansatz
to derive the low-dimensional system of differential equations that governs the
macroscopic dynamics of the high-dimensional problem. The choice of parameters
of the system is motivated by the search for so-called Chimera states; stable
phase configurations with partial synchronization. Our main result is the
derivation of the low-dimensional system following Ott-Antonsens Ansatz and
findings of periodic and chaotic Chimeras.
