Simulation of a Hybrid Optical/Radio/Acoustic Extension to IceCube for   EeV Neutrino Detection
  Astrophysical neutrinos at $\sim$EeV energies promise to be an interesting source for astrophysics and particle physics. Detecting the predicted cosmogenic (``GZK'') neutrinos at 10$^{16}$ - 10$^{20}$ eV would test models of cosmic ray production at these energies and probe particle physics at $\sim$100 TeV center-of-mass energy. While IceCube could detect $\sim$1 GZK event per year, it is necessary to detect 10 or more events per year in order to study temporal, angular, and spectral distributions. The IceCube observatory may be able to achieve such event rates with an extension including optical, radio, and acoustic receivers. We present results from simulating such a hybrid detector. 
D. Besson, S. B\"oser, R. Nahnhauer, P. B. Price, and J. A.   Vandenbroucke (for the IceCube Collaboration)