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首页> 外文期刊>Physical review, D >Time-dependent rate of multicomponent dark matter: Reproducing the DAMA/LIBRA phase-2 results
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Time-dependent rate of multicomponent dark matter: Reproducing the DAMA/LIBRA phase-2 results

机译：随时间变化的多组分暗物质速率：再现DAMA / LIBRA 2期结果

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The current paradigm for dark matter direct detection is to assume that the dark sector is solely composed of a single particle species. In this short paper, we make the observation that dark matter comprising both a light and a heavy component that modulate out of phase leads to interesting phenomenology in annual modulation experiments. For an illustrative example, we use the recently released DAMA/LIBRA phase-2 results with a lower energy threshold. Immediately after, it was argued that a one-component spin-independent dark matter explanation of the observed annual modulation is strongly disfavored or excluded unless isospin-violating couplings are invoked. We show that a simple two-component extension can reproduce the observed spectrum without the need to invoke fine-tuned couplings. Using the publicly available DAMA/LIBRA data, we perform a fit of the DAMA/LIBRA energy spectrum of the annual modulation amplitude to a scenario with two dark matter components. We also take into account how gravitational focusing affects the phases of the light and a heavy components differently, which leads to nontrivial effects in the total time-dependent rate. Our results show that there exists a unique solution in agreement with the data in the simplest case of isospin-conserving couplings with equal cross sections. The distinctive features found in this work are crucial for a dark matter interpretation of any observed annual modulation.
机译：用于暗物质直接检测的当前范例是假设暗区仅由单个粒子组成。在这篇简短的论文中，我们观察到，由异相调制的既包含轻组分又包含重组分的暗物质会在年度调制实验中引起有趣的现象学。作为说明性示例，我们使用具有较低能量阈值的最新发布的DAMA / LIBRA 2期结果。紧接着，有论点强烈反对或排除观察到的年度调制的单组分自旋无关暗物质解释，除非调用违反同位旋的偶联。我们表明，简单的两成分扩展可以重现观察到的光谱，而无需调用微调的耦合。使用公开可用的DAMA / LIBRA数据，我们将年调制幅度的DAMA / LIBRA能谱拟合到具有两个暗物质成分的场景。我们还考虑了引力聚焦如何不同地影响轻组分和重组分的相位，从而导致总时间依赖性速率的非平凡影响。我们的结果表明，在具有等截面的同位旋量守恒的最简单情况下，存在与数据一致的独特解决方案。这项工作中发现的独特特征对于暗物质解释任何观测到的年度调制至关重要。

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