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Energetic positrons can serve as an important indirect sign ature of dark matter. Computing the positron flux expected in a given dark matter model involves s olving transport equations in the galaxy. Existing calculations solve the equations inside t he diffusion zone, where galactic magnetic fields confine positrons, and assume vanishing positro n density on the boundaries of this zone. However, in many models, a substantial fraction of the dark matter halo lies outside the diffusion zone, and positrons produced there can contribut e to he flux at Earth. We calculate this correction for a variety of models. The corresponding enhan cement in the flux of energetic photons produced by the inverse Compton scattering of positron on starlight and cosmic microwave background is also calculated. Maximal flux enhancements of order 20% are found in both cases.

Comment on Calculation of Positron Flux from Galactic Dark Matter