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

机译:暗物质对EGRET伽马射线过量的解释是否与反质子测量兼容?

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摘要

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.
机译:与传统银河模型的预期相比,对于超过1 GeV的能量,漫射银河EGRET伽马射线数据显示出明显过量。这种过量显示了暗物质WIMP歼灭所预期的所有特征:a)它存在并且在所有天空方向上具有相同的光谱,而不仅仅是银河平面,正如WIMP歼灭所预期的那样b)它以形式显示了一个有趣的子结构一个距银河系中心14 kpc的甜甜圈形环,其中的恒星环表明矮星系可能会坠入。根据过量的光谱形状,WIMP质量估计在50至100 GeV之间,而根据强度,可以重建光晕轮廓,这可以解释大约11 kpc时旋转曲线斜率的奇特变化(由于以14 kpc的速率连接到DM环)。最近,Bergstrom等人对此进行了宣称。反质子通量排除了对EGRET伽马射线过量的DM解释,因为在其具有各向同性扩散的传播模型中,反质子的通量将远远超出观察到的通量。但是,由于垂直于圆盘的粒子对流以及局部环境中的不均匀性,因此传播可能在很大程度上是各向异性的。结果表明,各向异性传播可以将反质子的产量降低一个数量级,同时仍与B / C比保持一致。因此,很难使用反质子来搜索{\ it light} DM粒子,该粒子会产生与背景相似的反质子谱,但是反质子是在传播模型中调整许多退化参数的理想方法。

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