Turning Around along the Cosmic Web
Jounghun Lee (1), Gustavo Yepes (2) ((1) Seoul National University,, (2) Universidad Autonoma de Madrid)

TL;DR
This study investigates how the cosmic web environment influences the occurrence of bound violations in galaxy groups, using simulations to analyze turn-around radii and their relation to dark energy constraints.
Contribution
It demonstrates that the cosmic web environment affects the likelihood of bound violations, challenging the spherical collapse model's predictions and proposing a new method to constrain dark energy.
Findings
Average turn-around radii are below the spherical bound-limit.
Bound violations are possible for individual groups.
The cosmic web reduces the rarity of bound violations.
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 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 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…
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