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Gamma-Ray Excess from the Galactic Center and Supergravity Models

Y. Mambrini
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Abstract

We analyse the effect of the compression of the dark matter due to the infall of baryons to the galactic center on the gamma-ray flux. In addition, we also consider the effect of non-universal supersymmetric soft terms. This analysis shows that neutralino dark matter annihilation can give rise to signals largely reachable by future experiments like GLAST. This is a remarkable result if we realise that direct detection experiments will only be able to cover a small region of the parameter space. Actually, in this SUGRA framework we have also been able to fit present excess from EGRET and CANGAROO using different non-universal scenarios, and even fit the data from both experiments with only one scenario. We have also studied the recent HESS data implying a neutralino heavier than 12 TeV. Because of such a heavy neutralino, it is not natural to find solutions in the SUGRA framework. Nevertheless we have carried out a quite model-independent analysis, and found the conditions required on the particle physics side to fit the HESS data thanks to dark matter annihilation.

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Y. Mambrini. 2005-09-27. Gamma-Ray Excess from the Galactic Center and Supergravity Models. https://doi.org/10.1088/1742-6596%2F39%2F1%2F041

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