论文标题
一无所有：宇宙空隙作为粒子暗物质的探针
Got plenty of nothing: cosmic voids as a probe of particle dark matter
论文作者
论文摘要
通过暗物质歼灭或衰减产生的辐射来搜索粒子暗物质信号必须应对预测信号的极度晕厥以及掩盖天体物理背景的存在。已经表明，使用宇宙辐射场的波动之间使用相关信息，因为由于天体物理源和暗物质发射具有不同的特征，因此允许从天体物理排放中分解天体物理排放的纯暗物质信号。通过查看暗物质光环（过度），已经提出并采用了互相关技术，并采用了暗物质研究。在本文中，我们通过专注于宇宙空隙提供的暗物质分布的信息，并专门研究γ-射线的暗物质发射的信息来扩展技术：我们表明，与晕晕相比，相比，散发出的相对范围的相对范围void voids dearpoys versical vissicals cartects Is vaste vailsy Is vents cardiestions dearpoys vissicals carterys vassicals caid vasts vasts callops vasts carterys vassical cartiage vasts的相对范围，天气素质的相对范围均具有相对的影响。 $ s/b $（甚至显着）大于1的衰减寿命，最高$ 2 \ times 10^{30} $ s。这与光晕的情况不同，其中$ s/b $通常小于1（甚至）小于1。我们表明，即将进行的星系调查（例如欧几里得）与未来一代的伽玛射线探测器相结合，具有改进的规格的能力，能够提供此类信号的提示，可预测的意义为Galaxies $5.7σ$1.6σ$1.6σ$ 5.7 $ $1.6σ。预计在暗物质生命周期内可实现的利用空隙将改善当前范围，即$ 25 \ div900 $ gev的质量范围。
The search for a particle dark matter signal in terms of radiation produced by dark matter annihilation or decay has to cope with the extreme faintness of the predicted signal and the presence of masking astrophysical backgrounds. It has been shown that using the correlated information between the dark matter distribution in the Universe with the fluctuations of the cosmic radiation fields has the potential to allow setting apart a pure dark matter signal from astrophysical emissions, since spatial fluctuations in the radiation field due to astrophysical sources and dark matter emission have different features. The cross-correlation technique has been proposed and adopted for dark matter studies by looking at dark matter halos (overdensities). In this paper we extend the technique by focusing on the information on dark matter distribution offered by cosmic voids, and by looking specifically at the gamma-ray dark matter emission: we show that, while being underdense and therefore producing a reduced emission as compared to halos, nevertheless in voids the relative size of the cross-correlation signal due to decaying dark matter vs. astrophysical sources is significantly more favourable, producing signal-to-background ratios $S/B$ (even significantly) larger than 1 for decay lifetimes up to $2 \times 10^{30}$ s. This is at variance with the case of halos, where $S/B$ is typically (even much) smaller than 1. We show that forthcoming galaxy surveys such as Euclid combined with future generation gamma-ray detectors with improved specifications have the ability to provide a hint of such a signal with a predicted significance up to $5.7σ$ for galaxies and $1.6σ$ for the cosmic shear. The bound on the dark matter lifetime attainable exploiting voids is predicted to improve on current bounds in a mass range for the WIMP of $25\div900$ GeV.
