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arXiv 2409.02780astro-ph.CO
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空洞到底有多空?

How empty are the voids?

Anton N. Baushev

AI总结:

本文通过解析求解空洞中心密度,发现大多数空洞中心低密度约为-50%,小空洞可更空但数量随低密度增大而骤减,大空洞低密度始终小于50%。

摘要:

我们找到了空洞最小物质密度(即其中心密度)的解析解。结果表明,空洞并不那么空:大多数空洞的中心低密度为 $Δ_c \sim -50\\%$(这意味着它们中心的物质密度仅比宇宙平均水平低两倍)。对于小空洞(半径 $R_0\simeq 5-10$ Mpc),低密度可以显著更大,但随着 $|Δ_c|$ 超过 $50\\%$,空洞数量迅速减少,且 $Δ_c < -80\\%$ 的空洞实际上不存在。大空洞($R_0\ge 40$ Mpc)始终具有 $|Δ_c| < 50\\%$。

英文摘要:

We find an analytical solution for the minimal matter density of a void, its central density. It turns out that the voids are not so empty: most of the voids have the central underdensity $Δ_c \sim -50\%$ (which means that the matter density in their centers is only two times lower than in the Universe on average). For small voids (of radius $R_0\simeq 5-10$~{Mpc}), the underdensity can be significantly greater, but the number of voids decreases rapidly with increasing of $|Δ_c|$ over $50\%$, and voids with $Δ_c < -80\%$ are practically absent. The large voids ($R_0\ge 40$~{Mpc}) always have $|Δ_c| < 50\%$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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