Cosmology Data Analysis

During a supporting-research internship in the PNU Cosmology Group, advised by Prof. Junsup Shim, I read FoF halo catalogs produced by his Fortran simulations and connected them to Python analysis and visualization. My role did not include developing the simulation itself.

• Interpreted particle counts, centers, and second-moment blocks in binary catalogs and converted coordinate units.
• Worked with the halo mass function (HMF) and two-point correlation function (2pCF), learning volume and bin-width normalization and pair counting with periodic boundaries.
• Implemented interactive visualization using eigenvalues and eigenvectors of second-moment matrices. Display sizes are catalog-specific RMS scales, not halo boundary radii.

FoF_Simulation_Plot is the public project repository. The repository-content description here is pinned to youngjinphys/FoF_Simulation_Plot@c059a7934d78c2e5798798b797ab3754ae9d48dd (2026-09-13). That revision contains a public subset of catalog-parsing, coordinate-conversion, and visualization code. It excludes the original catalogs and quantitative results and does not reproduce the complete HMF and 2pCF analysis.

I thank Prof. Junsup Shim for his guidance and the opportunity to work with research data.