Turning Around along the Cosmic Web

Abstract

A bound-violation designates a case that the turn-around radius of a bound object exceeds the upper limit put by the spherical collapse model based on the standard $\Lambda$CDM paradigm. Given that the turn-around radius of a bound object is a stochastic quantity and that the spherical model overly simplifies the true gravitational collapse which actually proceeds anisotropically along the cosmic web, the rarity of the occurrence of a bound violation may depend on the web environment. Assuming a Planck cosmology, we numerically construct the bound-zone peculiar velocity profiles along the cosmic web (filaments and sheets) around the isolated groups with virial mass $M_{\mathrm{v}}\ge 3\times 10^{13}{h}^{-1}{M}_{\odot }$ identified in the Small MultiDark Planck simulations and determine the radial distances at which their peculiar velocities equal the Hubble expansion speed as the turn-around radii of the groups. It is found that although the average turn-around radii of the isolated groups are well below the spherical bound-limit on all mass scales, the bound violations are not forbidden for individual groups and that the cosmic web has an effect of reducing the rarity of the occurrence of a bound violation. Explaining that the spherical bound limit on the turn-around radius in fact represents the threshold distance up to which the intervention of the external gravitational field in the bound-zone peculiar velocity profiles around the non-isolated groups stays negligible, we discuss the possibility of using the threshold distance scale to constrain locally the equation of state of dark energy .

accepted for publication in ApJ, revised version, minor mistakes corrected, 12 figures, 2 tables

References in corpus (20)

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Cited by in corpus (16)

• The Effect of Modified Gravity on the Odds of the Bound Violations of the Turn-Around Radii
• Turnaround radius of galaxy clusters in N-body simulations
• Effects of modified gravity on the turnaround radius in cosmology
• Cosmic structure sizes in generic dark energy models
• Estimating the Turn-Around Radii of Six Isolated Galaxy Groups in the Local Universe
• Distinguishing cosmologies using the turn-around radius near galaxy clusters
• Constraining phantom braneworld model from cosmic structure sizes
• Turnaround size of non-spherical structures
• Cosmological applications of the Brown-York quasilocal mass
• Network analysis of the COSMOS galaxy field
• Turnaround physics beyond spherical symmetry
• The maximum turnaround radius for axisymmetric cosmic structures
• Infall near clusters of galaxies: comparing gas and dark matter velocity profiles
• Dark matter haloes: a multistream view
• Turnaround radius in scalar-tensor gravity with quasilocal mass
• Searching for a signature of turnaround in galaxy clusters with convolutional neural networks