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WIMP direct detection experiments are just reaching the sensitivity requiredto detect galactic dark matter in the form of neutralinos. Data from theseexperiments are usually analysed under the simplifying assumption that theMilky Way halo is an isothermal sphere with maxwellian velocity distribution.Observations and numerical simulations indicate that galaxy halos are in facttriaxial and anisotropic. Furthermore, in the cold dark matter paradigmgalactic halos form via the merger of smaller subhalos, and at least someresidual substructure survives. We examine the effect of halo modelling on WIMPexclusion limits, taking into account the detector response. Triaxial andanisotropic halo models, with parameters motivated by observations andnumerical simulations, lead to significant changes which are different fordifferent experiments, while if the local WIMP distribution is dominated bysmall scale clumps then the exclusion limits are changed dramatically.Comment: 9 pages, 9 figures, version to appear in Phys. Rev. D, minor change

Effect of halo modeling on weakly interacting massive particle exclusion limits