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| Main Author: | |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.02780 |
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| _version_ | 1866909304862277632 |
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| author | Baushev, Anton N. |
| author_facet | Baushev, Anton N. |
| contents | 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 $|Δ_c| < 50\%$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_02780 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | How empty are the voids? Baushev, Anton N. Cosmology and Nongalactic Astrophysics 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 $|Δ_c| < 50\%$. |
| title | How empty are the voids? |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2409.02780 |