Exciting Dark Matter and the INTEGRAL/SPI 511 keV signal

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dc.creatorFinkbeiner, Douglas P.
dc.creatorWeiner, Neal
dc.date2007-02-21
dc.date2007-05-10
dc.date.accessioned2026-07-07T11:21:12Z
dc.date.available2026-07-07T11:21:12Z
dc.descriptionWe propose a WIMP candidate with an ``excited state'' 1-2 MeV above the ground state, which may be collisionally excited and de-excites by e+e- pair emission. By converting its kinetic energy into pairs, such a particle could produce a substantial fraction of the 511 keV line observed by INTEGRAL/SPI in the inner Milky Way. Only a small fraction of the WIMPs have sufficient energy to excite, and that fraction drops sharply with galactocentric radius, naturally yielding a radial cutoff, as observed. Even if the scattering probability in the inner kpc is << 1% per Hubble time, enough power is available to produce the ~3x10^42 pairs per second observed in the Galactic bulge. We specify the parameters of a pseudo-Dirac fermion designed to explain the positron signal, and find that it annihilates chiefly to e+e- and freezes out with the correct relic density. We discuss possible observational consequences of this model.
dc.description11 pages; v2 references added; v3 updated model to allow for single excitations and calculation of single excitation cross section; updated halo profiles; references added; conclusions unchanged
dc.identifierhttps://arxiv.org/abs/astro-ph/0702587
dc.identifierhttp://arxiv.org/abs/astro-ph/0702587
dc.identifierPhys.Rev.D76:083519,2007
dc.identifierdoi:10.1103/PhysRevD.76.083519
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/194196
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleExciting Dark Matter and the INTEGRAL/SPI 511 keV signal
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