  We propose a simple singularity-free coordinate transformation that could be
implemented in Maxwell's equations in order to simulate one aspect of a Kerr
black hole. Kerr black holes are known to force light to rotate in a
predetermined direction inside the ergoregion. By making use of cosmological
analogies and the theoretical framework of transformation optics, we have
designed a metamaterial that can make light behave as if it is propagating
around a rotating cosmological massive body. We present numerical simulations
involving incident Gaussian beams interacting with the materials to verify our
predictions. The ergoregion is defined through the dispersion curve of the
off-axis permittivities components.
