论文标题
用脉冲星时阵列探测小型功率光谱
Probing Small-Scale Power Spectra with Pulsar Timing Arrays
论文作者
论文摘要
暗物质（DM）的模型可以通过提高小尺度上的密度扰动来留下宇宙小尺度结构的独特烙印。我们研究了脉冲星定时阵列搜索和约束Subhalos的能力。我们认为的DM模型是$λ$ cdm，QCD轴微量簇，具有早期物质统治的模型以及通货膨胀期间产生的矢量DM的普通绝热扰动。我们表明，$λ$ CDM在很大程度上是由于以银河系的潮汐剥离效应而无法触及的PTA（以及提议检测DM小规模结构的所有其他探针）。尽管这至关重要的是轴突遗物密度是否由未对准或弦贡献主导。可以在未来的PTA中观察到具有重新温度的物质统治的模型。最后，如果通货膨胀期间产生的向量DM比$ 10^{ - 16} \，{\ rm gev} $轻。我们还将公开提供为Python Monte Carlo工具，用于从任何DM子结构模型中生成PTA时间延迟信号。
Models of Dark Matter (DM) can leave unique imprints on the Universe's small scale structure by boosting density perturbations on small scales. We study the capability of Pulsar Timing Arrays to search for, and constrain, subhalos from such models. The models of DM we consider are ordinary adiabatic perturbations in $Λ$CDM, QCD axion miniclusters, models with early matter domination, and vector DM produced during inflation. We show that $Λ$CDM, largely due to tidal stripping effects in the Milky Way, is out of reach for PTAs (as well as every other probe proposed to detect DM small scale structure). Axion miniclusters may be within reach, although this depends crucially on whether the axion relic density is dominated by the misalignment or string contribution. Models where there is matter domination with a reheat temperature below 1 GeV may be observed with future PTAs. Lastly, vector DM produced during inflation can be detected if it is lighter than $10^{-16} \,{\rm GeV}$. We also make publicly available a Python Monte Carlo tool for generating the PTA time delay signal from any model of DM substructure.
