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arXiv 0710.3169hep-phastro-ph
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Gamma-Ray对超对称暗物质湮灭的新贡献

New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation

Torsten Bringmann, Lars Bergstrom, Joakim Edsjo

备注：
Replaced Fig. 2c which by mistake displayed the same spectrum as Fig. 2d; the radiative corrections reported here are now implemented in DarkSUSY which is available at http://www.physto.se/~edsjo/darksusy/
发表信息：
JHEP0801:049,2008
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摘要：

我们计算的电磁辐射校正所有领先的湮灭过程中可能发生的银河系暗物质晕，暗物质的超对称扩展的标准模型（MSSM和mSUGRA）的框架，并提出了扫描的结果，在参数空间是一致的，目前观测界的宇宙的暗物质密度。虽然这些过程以前已经被认为是在一些特殊的情况下，由不同的作者，我们的新的一般分析表明，新的有趣的结果与大的修正，可能是重要的，例如，在即将发射的GLAST伽马射线太空望远镜上进行搜索。特别是，它指出，参数空间的区域，有一个近简并之间的暗物质中性伴子和τ slepton，辐射校正可能会提高伽玛射线产量高达三个或四个数量级，即使中性伴子质量大大低于TeV规模，并将增强非常典型的签名暗物质湮灭，即在暗物质粒子的质量上有一个急剧的台阶。由于这是一个特别有趣的区域，更多的约束mSUGRA模型的超对称性，我们使用广泛的扫描在这个参数空间，以验证我们的研究结果的意义。我们还重新访问的直接湮灭的中性子到光子，并指出，对于相当一部分的参数空间，内部韧致辐射是更重要的间接暗物质搜索比线信号。

英文摘要：

We compute the electromagnetic radiative corrections to all leading annihilation processes which may occur in the Galactic dark matter halo, for dark matter in the framework of supersymmetric extensions of the Standard Model (MSSM and mSUGRA), and present the results of scans over the parameter space that is consistent with present observational bounds on the dark matter density of the Universe. Although these processes have previously been considered in some special cases by various authors, our new general analysis shows novel interesting results with large corrections that may be of importance, e.g., for searches at the soon to be launched GLAST gamma-ray space telescope. In particular, it is pointed out that regions of parameter space where there is a near degeneracy between the dark matter neutralino and the tau sleptons, radiative corrections may boost the gamma-ray yield by up to three or four orders of magnitude, even for neutralino masses considerably below the TeV scale, and will enhance the very characteristic signature of dark matter annihilations, namely a sharp step at the mass of the dark matter particle. Since this is a particularly interesting region for more constrained mSUGRA models of supersymmetry, we use an extensive scan over this parameter space to verify the significance of our findings. We also re-visit the direct annihilation of neutralinos into photons and point out that, for a considerable part of the parameter space, internal bremsstrahlung is more important for indirect dark matter searches than line signals.

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