Is the Dark Matter interpretation of the EGRET gamma ray excess compatible with antiproton measurements?

Details Is the Dark Matter interpretation of the EGRET gamma ray excess compatible with antiproton measurements? Is the Dark Matter interpretation of the EGRET gamma ray excess compatible with antiproton measurements?

2006-12-16

arxiv.org/abs/astro-ph/0612462v1

AIPConf.Proc.903:607-612,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, based on talks delivered at 7th UCLS Symposium on DM and DE, Feb. 2006, Space Part 2006, Beijing, April 20

Scientific paper

10.1063/1.2735258

The diffuse galactic EGRET gamma ray data show a clear excess for energies above 1 GeV in comparison with the expectations from conventional galactic models. This excess shows all the features expected from Dark Matter WIMP Annihilation: a)it is present and has the same spectrum in all sky directions, not just in the galactic plane, as expected for WIMP annihilation b) it shows an interesting substructure in the form of a doughnut shaped ring at 14 kpc from the centre of the galaxy, where a ring of stars indicated the probable infall of a dwarf galaxy. From the spectral shape of the excess the WIMP mass is estimated to be between 50 and 100 GeV, while from the intensity the halo profile is reconstructed, which is shown to explain the peculiar change of slope in the rotation curve at about 11 kpc (due to the ring of DM at 14 kpc). Recently it was claimed by Bergstrom et al. that the DM interpretation of the EGRET gamma ray excess is excluded by the antiproton fluxes, since in their propagation model with isotropic diffusion the flux of antiprotons would be far beyond the observed flux. However, the propagation can be largely anisotropic, because of the convection of particles perpendicular to the disc and inhomogeneities in the local environment. It is shown that anisotropic propagation can reduce the antiproton yield by an order of magnitude, while still being consistent with the B/C ratio. Therefore it is hard to use antiprotons to search for {\it light} DM particles, which yield a similar antiproton spectrum as the background, but the antiprotons are a perfect means to tune the many degenerate parameters in the propagation models.

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