Effects of Unstable Dark Matter on Large-Scale Structure and Constraints from Future Surveys
Effects of Unstable Dark Matter on Large-Scale Structure and Constraints from Future Surveys
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不稳定暗物质对大尺度结构的影响以及未来调查的限制
DOI：
10.1103/physrevd.85.043514
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发表时间：
2012
影响因子：
5
通讯作者：
A. Zentner
中科院分区：
文献类型：
--
作者：
Mei;A. Zentner
在本文中，我们探讨了衰变暗物质（DDM）的大尺度结构和可能的限制星系成像调查的影响。DDM模型已经被研究，部分是为了解决标准冷暗物质模型的预测和星系结构观测之间的明显差异。我们的研究旨在开发这些模型的独立约束。在这样的模型中，DDM衰变成质量较小的稳定暗物质（SDM）粒子和一个明显较轻的粒子。母DDM和子SDM之间的小质量分裂为SDM提供了反冲或“反冲”速度vk，引起物质波动的自由流抑制。这种抑制可以通过弱透镜功率谱来探测，这些功率谱是由一些即将到来的成像调查测量的，这些调查的主要目的是约束暗能量。使用线性微扰理论单独有效的尺度（多极90 km/s，寿命约1-5 Gyr。为了估计更积极的约束，我们使用一个简单的晕演化模型，是在良好的协议与数值模拟的非线性校正透镜功率。在我们最雄心勃勃的预测中，使用多极< 3000，我们发现成像调查可以敏感到vk ~ 10公里/秒的寿命< 10 Gyr。透镜将提供一个特别有趣的补充，现有的限制，因为他们将探测长寿命制度远远优于当代技术。对这些雄心勃勃的预测的一个警告是，在实现这些预测之前，非线性尺度上扰动的演变需要通过数值模拟进行很好的校准。这项工作激发了追求这样一个数值模拟运动，以约束暗物质与宇宙学弱透镜。
In this paper we explore the effect of decaying dark matter (DDM) on large-scale structure and possible constraints from galaxy imaging surveys. DDM models have been studied, in part, as a way to address apparent discrepancies between the predictions of standard cold dark matter models and observations of galactic structure. Our study is aimed at developing independent constraints on these models. In such models, DDM decays into a less massive, stable dark matter (SDM) particle and a significantly lighter particle. The small mass splitting between the parent DDM and the daughter SDM provides the SDM with a recoil or "kick" velocity vk, inducing a free-streaming suppression of matter fluctuations. This suppression may be probed via weak lensing power spectra measured by a number of forthcoming imaging surveys that aim primarily to constrain dark energy. Using scales on which linear perturbation theory alone is valid (multipoles 90 km/s for lifetimes ~ 1-5 Gyr. To estimate more aggressive constraints, we model nonlinear corrections to lensing power using a simple halo evolution model that is in good agreement with numerical simulations. In our most ambitious forecasts, using multipoles < 3000, we find that imaging surveys can be sensitive to vk ~ 10 km/s for lifetimes < 10 Gyr. Lensing will provide a particularly interesting complement to existing constraints in that they will probe the long lifetime regime far better than contemporary techniques. A caveat to these ambitious forecasts is that the evolution of perturbations on nonlinear scales will need to be well calibrated by numerical simulations before they can be realized. This work motivates the pursuit of such a numerical simulation campaign to constrain dark matter with cosmological weak lensing.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.