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arXiv 1502.02007astro-ph.COastro-ph.HEhep-ph
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来自河外gamma-ray背景的衰变暗物质的限制

Constraints on decaying dark matter from the extragalactic gamma-ray background

Shin'ichiro Ando, Koji Ishiwata

摘要:

如果暗物质是不稳定的,质量在GeV-TeV范围内,它的衰变产生高能光子,对河外伽马射线背景(EGRB)有贡献。我们通过分析费米卫星测量的50个月EGRB数据来约束暗物质衰变,对于不同的衰变通道,这些通道由几个具有R宇称破坏的超对称场景激发。我们采用了最新的天体物理模型的各种源类,如活动星系核和恒星形成的星系,并适当考虑相关的不确定性。对于大范围的暗物质质量,寿命的下限是非常严格的,不包括质量在几百GeV和~ 1 TeV之间的寿命短于10^28 s,例如,对于b \bar{b}衰减通道。此外,大多数解释异常正电子过剩的暗物质模型也被排除在外。这些限制是强大的,很少依赖于天体物理的不确定性,不像其他探测器,如银河系正电子或反质子。

英文摘要:

If dark matter is unstable and the mass is within GeV-TeV regime, its decays produce high-energy photons that give contribution to the extragalactic gamma-ray background (EGRB). We constrain dark matter decay by analyzing the 50-month EGRB data measured with Fermi satellite, for different decay channels motivated with several supersymmetric scenarios featuring R-parity violation. We adopt the latest astrophysical models for various source classes such as active galactic nuclei and star-forming galaxies, and take associated uncertainties properly into account. The lower limits for the lifetime are very stringent for a wide range of dark matter mass, excluding the lifetime shorter than 10^28 s for mass between a few hundred GeV and ~1TeV, e.g., for b\bar{b} decay channel. Furthermore, most dark matter models that explain the anomalous positron excess are also excluded. These constraints are robust, being little dependent on astrophysical uncertainties, unlike other probes such as Galactic positrons or anti-protons.

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