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Abstract
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 $\Delta_c \sim -50\%$ (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 $|\Delta_c|$ over $50\%$, and voids with $\Delta_c < -80\%$ are practically absent. The large voids ($R_0\ge 40$~{Mpc}) always have $|\Delta_c| < 50\%$.
Biography
Anton N. Baushev was born in the USSR in 1977. He studied physics in the Moscow Institute of Physics and Technology and obtained a Ph.D. in physics in 2003. Then he worked in Italy, France, Russia, Germany, Chile. Now he is a leading scientific researcher of the Joint Institute for Nuclear Research in Dubna, a small scientific town near Moscow. His research interests are mainly in the fields of cosmology, astroparticle physics and astrophysics.
Host: Xiao-Gang He
Online link: https://meeting.tencent.com/dm/UApX4TIhX76C
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