透过暗维度的镜子：利用X射线脉冲星微引力透镜搜寻体黑洞暗物质
Through the Looking Glass into the Dark Dimension: Searching for Bulk Black Hole Dark Matter with Microlensing of X-ray Pulsars
AI总结：
本文提出利用X射线脉冲星微引力透镜搜寻暗维度中的五维原初黑洞，该机制可解释全部暗物质，并扩展探测范围至小行星质量窗口。
摘要：
隐藏在暗维度巨大体积中的原初黑洞（PBHs）可以逃避对其霍金辐射未观测到的约束。由于这些五维（5D）原初黑洞比相同质量$M$的通常4D原初黑洞更大、更冷、寿命更长，如果$10^{11} \lesssim M/{\rm g} \lesssim 10^{21}$，它们可以构成所有宇宙暗物质，即将4D允许区域远远扩展到小行星质量窗口。我们表明，这些难以捉摸的原初黑洞可以通过测量来自遥远脉冲星的X射线微引力透镜事件来搜寻。我们还表明，未来的X射线微引力透镜实验将能够探测到有趣的质量范围（$10^{16.5} \lesssim M/{\rm g} \lesssim 10^{17.5}~{\rm g}$），在该范围内，基于4D史瓦西原初黑洞的全暗物质解释因未观测到其霍金辐射而被排除。
英文摘要：
Primordial black holes (PBHs) hidden in the incredible bulk of the dark dimension could escape constraints from non-observation of their Hawking radiation. Since these five-dimensional (5D) PBHs are bigger, colder, and longer-lived than usual 4D PBHs of the same mass $M$, they could make all cosmological dark matter if $10^{11} \lesssim M/{\rm g} \lesssim 10^{21}$, i.e., extending the 4D allowed region far down the asteroid-mass window. We show that these evasive PBHs could be search for by measuring their $X$-ray microlensing events from faraway pulsars. We also show that future $X$-ray microlensing experiments will be able to probe the interesting range ($10^{16.5} \lesssim M/{\rm g} \lesssim 10^{17.5}~{\rm g}$) where an all dark matter interpretation in terms of 4D Schwarzschild PBHs is excluded by the non-observation of their Hawking radiation.
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