Gravitino dark matter in R-parity breaking vacua
Gravitino dark matter in R-parity breaking vacua
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DOI：
10.1088/1126-6708/2007/03/037
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发表时间：
2007-02
影响因子：
5.4
通讯作者：
W. Buchmuller;L. Covi;K. Hamaguchi;A. Ibarra;T. Yanagida
中科院分区：
文献类型：
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作者：
W. Buchmuller;L. Covi;K. Hamaguchi;A. Ibarra;T. Yanagida
我们表明，在小的R-宇称和轻子数破缺耦合的情况下，原始核合成，热leptogenesis和引力子暗物质是自然一致的引力子质量m3/25 GeV。我们提出了一个模型，其中R-宇称破缺与B-L破缺相联系，该模型预测了所需的小耦合。亚稳态次轻超粒子的衰变长度通常大于几厘米，在LHC上具有特征签名。残余引力子衰变产生的光子通量可能是由EGRET数据（引力子质量为m3/2 ~ 10 GeV）得到的河外弥漫γ射线通量中明显过剩的一部分。在这种情况下，可以预期GLAST在不久的将来会发出明确的信号。
We show that in the case of small R-parity and lepton number breaking couplings, primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter are naturally consistent for gravitino masses m3/25 GeV. We present a model where R-parity breaking is tied to B-L breaking, which predicts the needed small couplings. The metastable next-to-lightest superparticle has a decay length that is typically larger than a few centimeters, with characteristic signatures at the LHC. The photon flux produced by relic gravitino decays may be part of the apparent excess in the extragalactic diffuse gamma-ray flux obtained from the EGRET data for a gravitino mass m3/2 ~ 10 GeV. In this case, a clear signal can be expected from GLAST in the near future.