Probing a dark matter density spike at the Galactic CenterReportar como inadecuado

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1 IPPP - Institute for Particle Physics Phenomenology 2 LAPTH - Laboratoire d-Annecy-le-Vieux de Physique Théorique

Abstract : The dark matter halo profile in the inner Galaxy is very uncertain. Yet itsradial dependence toward the Galactic Center is of crucial importance for thedetermination of the gamma-ray and radio fluxes originating from dark matterannihilations. Here we use synchrotron emission to probe the dark matter energydistribution in the inner Galaxy. We first solve the problem of the cosmic raydiffusion on very small scales, typically smaller than 10^{-3} pc, by using aGreen-s function approach and use this technique to quantify the effect of aspiky profile rhor ~ r^{-7-3} on the morphology and intensity of thesynchrotron emission expected from dark matter. We illustrate our results using10 and 800 GeV candidate weakly interacting dark matter particles annihilatingdirectly into e+ e-. Our most critical assumptions are that the dark matter isheavier than a few GeV and directly produces a reasonable amount of electronsand positrons in the Galaxy. We conclude that dark matter indirect detectiontechniques including the Planck experiment could be used to shed light on thedark matter halo profile on scales that lie beyond the capability of anycurrent numerical simulations.

Autor: T. Lacroix C. Boehm - J. Silk



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