Dark matter with two- and many-body decays and supernovae type Ia
Dark matter with two- and many-body decays and supernovae type Ia
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DOI：
10.1103/physrevd.90.103527
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发表时间：
2014-10
影响因子：
5
通讯作者：
Gordon Blackadder;S. Koushiappas
中科院分区：
文献类型：
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作者：
Gordon Blackadder;S. Koushiappas
我们提出了一个衰变的暗物质的情况下，子产品是一个单一的无质量的相对论性粒子和一个单一的，大质量的，但可能相对论性粒子。我们计算了大质量子粒子的速度分布和相应的状态方程，并导出了它在膨胀宇宙中的动力学演化。此外，我们提出了一个模型的衰变暗物质，有许多无质量的相对论性子粒子连同一个大质量的粒子在休息。我们把约束这两个模型使用超新星Ia型观测。我们发现，对于一个女儿的相对论性分数为1%和更高，至少小于10陀螺仪的寿命被排除在外，与较大的相对论性分数约束较长的寿命。
We present a decaying dark matter scenario where the daughter products are a single massless relativistic particle and a single, massive but possibly relativistic particle. We calculate the velocity distribution of the massive daughter particle and its associated equation of state and derive its dynamical evolution in an expanding universe. In addition, we present a model of decaying dark matter where there are many massless relativistic daughter particles together with a massive particle at rest. We place constraints on these two models using supernovae type Ia observations. We find that for a daughter relativistic fraction of 1% and higher, lifetimes of at least less than 10 Gyrs are excluded, with larger relativistic fractions constraining longer lifetimes.