Spin conservation of cosmic filaments

TL;DR

This paper investigates the origin and evolution of cosmic filament spins, demonstrating that their angular momenta are linked to primordial tidal torques and can be reconstructed to probe initial universe conditions.

Contribution

It introduces a spin reconstruction method for cosmic filaments, connecting their spins to initial conditions and offering a new way to study early universe perturbations.

Findings

Filament spins are correlated with primordial tidal torques.

A spin reconstruction method can predict filament spins.

Filament spins preserve their initial directions to low redshifts.

Abstract

Cosmic filaments are the largest collapsing structure in the Universe. Recently both observations and simulations inferred that cosmic filaments have coherent angular momenta (spins). Here we use filament finders to identify the filamentary structures in cosmological simulations and study their physical origins, which are well described by the primordial tidal torque of their Lagrangian counterpart regions -- protofilaments. This initial angular momenta statistically preserve their directions to low redshifts. We further show that a spin reconstruction method can predict the spins of filaments and potentially relate their spins to the initial conditions of the Universe. This correlation provides a new way of constraining and obtaining additional information of the initial perturbations of the Universe.