Homogeneous spheroidal voids in ΛCDM become only slightly rounder, deviate from linear theory by z≈8, and retain substantial matter density μ>0.5 independent of eccentricity.
The radius, at which a galaxy group stops the Hubble stream, and the group mass: an exact analytical solution
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abstract
The gravitational field of a galaxy group or cluster slows down the Hubble stream and turns it speed to zero at some radius $R_0$. We offer an exact analytical relation between $R_0$ and the mass of the group.
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astro-ph.CO 1years
2026 1verdicts
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A semi-analytical approach to cosmic void evolution
Homogeneous spheroidal voids in ΛCDM become only slightly rounder, deviate from linear theory by z≈8, and retain substantial matter density μ>0.5 independent of eccentricity.