Cosmological imprints in the filament with DisPerSE

In the regime of cosmology and large-scale structure formation, filaments are vital components of the cosmic web. This study employs statistical methods to examine the formation, evolution, and cosmological constraints of filaments identified by DisPerSe. We run large-sample of N-body simulations to study the filament length and mass functions and their evolution. In general, the filament length function can be fitted by a power law with both the normalization and power index dependent on redshift and cosmological parameters. It is discovered that filament properties are influenced by various cosmological parameters, with σ_8 and n_s exhibiting slightly stronger dependence than Ω_m. We also uncover a three-stage filament formation process from z ∼ 3 to z ∼ 1: rapid formation of long and short filaments from z ∼ 3 to z ∼ 2, persistence of long filaments from z ∼ 2 to z ∼ 1, followed by fragmentation and increased prevalence of shorter filaments below z ∼ 1. Additionally, both large and small-scale perturbations in power spectrum influence filament growth, with a characteristic scale around k ∼ 0.265, wherein changes in matter fluctuations larger than this scale result in the formation of long filaments, while changes smaller than this scale have the opposite effect. These insights enhance our understanding of filament evolution and their cosmological relevance and also highlight their potential cosmological applications in observations.