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Weakly Interacting Massive Particle (WIMP) direct detection event ratecalculations usually rely on fairly simple, essentially static, analytic halomodels. This is largely since the resolution of numerical simulations is notyet large enough to allow the full numerical calculation of the WIMP densityand velocity distribution. In this paper we study the direct detection rate, inparticular its energy dependence and annual modulation, for the caustic ringhalo model. In this model, which uses simple assumptions to model the infall ofdark matter onto the halo, the distribution of the cold dark matter particlesat the Earth's location has a series of peaks in velocity space. We find thatthe sign of the annual modulation in the event rate changes as a function ofrecoil energy. These effects provide a potentially distinctive experimentalsignal.Comment: 6 pages, 3 figures. Version to appear in Phys. Rev. D. Comparsion  with DAMA annual modulation data replaced with qualitative discussio

Potential weakly interacting massive particle signature for the caustic ring halo model