Hongfei Yu

Cosmology!

README

This page hosts a collection of tidal field datasets derived from cosmological simulations. Tidal tensor fields capture the anisotropic gravitational environment, crucial for understanding structure formation, galaxy-halo relations, and large-scale structure studies.

Current Dataset Status:

  • TNG-100: 2 snapshots with multiple grid resolutions and particle assignment schemes
  • ELUCID: 2 snapshots from the gravity-only constrained N-body simulation

Data Specifications: Each tidal field file (2-5 GB) includes:

  • Tidal tensor components: $\partial_i \partial_j \Phi / a^2$ computed from particle density
  • Multiple smoothing scales (adaptive to cosmological resolution)
  • Particle assignment schemes: NGP (Nearest Grid Point) and CIC (Cloud-In-Cell)
  • Full-sky coverage at specified redshifts

Storage & Access: Files are hosted on Quark Cloud Drive (夸克网盘) for reliable domestic access. International mirror and advanced query features (DataTables.js) will be added in future updates.

Datasets

TNG-100: Illustris TNG Suite

Simulation Properties:

  • Box size: 110.7 Mpc/h
  • Particle count: 1024³ (dark matter)
  • Cosmology: Planck 2015
  • Public data release at TNG Project

Snapshot z=0 (a=1.0)

Grid: 512³

Grid: 1024³

Snapshot z=0.5 (a≈0.67)

Grid: 512³

Grid: 1024³

ELUCID: Evolved unLikely Coalescences for Initial Density

Simulation Properties:

  • Box size: 500 Mpc/h (periodic)
  • Particle count: 1024³ (dark matter)
  • Constraints: Constrained to match peculiar velocities within 100 Mpc/h of Milky Way
  • Cosmology: WMAP7
  • Public data at ELUCID Project

Snapshot z=0 (a=1.0)

Grid: 512³

Grid: 1024³

Snapshot z=0.3 (a≈0.77)

Grid: 512³

Grid: 1024³

Future Updates

  • Interactive sortable/filterable table (DataTables.js)
  • International CDN mirrors (Zenodo, HuggingFace Hub)
  • Additional simulations: Quijote, FLAME, etc.
  • File metadata & checksums for validation
  • Direct analysis tools (HDF5 viewers, visualization)

Last updated: March 2026