Constraining non-thermal dark matter by CMB
Constraining non-thermal dark matter by CMB
复制标题
通过 CMB 约束非热暗物质
DOI：
10.1088/1475-7516/2018/10/038
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发表时间：
2018
影响因子：
6.4
通讯作者：
Anshuman Maharana
中科院分区：
文献类型：
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作者：
R. Allahverdi;K. Dutta;Anshuman Maharana
一个早期物质统治的时期可以产生正确的暗物质丰度，因为暗物质湮灭率⟨σann v⟩f的范围很广。在这里，我们检查这种情况的⟨σann v⟩f低于热暗物质的标称值3 × 10−26 cm3 s−1的情况，可能由一些最近的实验表明。我们表明，在这种情况下，获得正确的遗迹丰度设置了早期物质统治时代持续时间的下界。另一方面，假设暴胀后宇宙的状态方程特征为w≥1/3，则标量谱指数ns在观测允许范围内的要求从上面限制了这一时期的持续时间。结合这些考虑，我们表明当前和未来的宇宙微波背景实验可以严格约束这种情况下的参数空间。特别是，标量与张量之比低于？（0.01）的暴胀模型可能不利于来自模量驱动的早期物质统治时代的非热超对称暗物质。
A period of early matter domination can give rise to the correct dark matter abundance for a broad range of dark matter annihilation rate ⟨ σann v ⟩f. Here, we examine this scenario for situations where ⟨ σann v ⟩f is below the nominal value for thermal dark matter 3 × 10−26 cm3 s−1 as possibly indicated by some recent experiments. We show that obtaining the correct relic abundance sets a lower bound on the duration of early matter domination era in this case. On the other hand, provided that the post-inflationary universe has an equation of state characterized by w ⩽ 1/3, the requirement that the scalar spectral index ns be within the observationally allowed range limits the duration of this epoch from above. By combining these considerations, we show that the current and future cosmic microwave background experiments can tightly constrain the parameter space for this scenario. In particular, models of inflation with a scalar-to-tensor ratio below ?(0.01) may disfavor non-thermal supersymmetric dark matter from a modulus-driven early matter domination epoch.
影响因子：
5
作者：
R. K. Leane;T. Slatyer;J. Beacom;K. Ng
通讯作者：
R. K. Leane;T. Slatyer;J. Beacom;K. Ng
DOI：
10.2172/1352047
发表时间：
2016-10
期刊：
--
影响因子：
--
作者：
K. Abazajian;Peter Adshead;Z. Ahmed;S. Allen;D. Alonso;K. Arnold;C. Baccigalupi;J. Bartlett;
通讯作者：
K. Abazajian;Peter Adshead;Z. Ahmed;S. Allen;D. Alonso;K. Arnold;C. Baccigalupi;J. Bartlett;