CPLUOS Astrophysics team meeting

Friday 9 Dec 2022, 14:00 → 15:20 Asia/Seoul

물리학과

https://uos-ac-kr.zoom.us/j/8264902652

COSMOLOGY

1 Hyeonmo's Report

Speaker: Hyeonmo Koo (University of Seoul)

Head-on Collision Fuzzy/Cold Dark Matter Halos

• No progress

2 Young's report. FoF and MST algorithm

Speaker: Young Ju

FoF and MST algorithm

• We apply the same method to simulation data (Horizon Run 4 (HR4) data).
• However, all of the simulation results seem to be weird at low linking-length.

3 Hannah's Report

Speaker: Hannah Jhee (University of Seoul)

Halos infalling a cluster through filaments

• Review
  • Perpendicular method
    • Straight line assumption
    • Filament not evolving.
    • Current (z = 0) nearest point is the most dominant source of effect.
• DisPerSE on all-time filaments stacked.
  • For randomly chosen 2000 segments
  • 9 sigma has less low-density segments.
  • 9 siama has (very slightly) more high-density segments than 6 sigma.
• Example halo: c00_h50380510
  • Only halo velocity
  • Filament velocity subtracted.
• c00: 40 massive halos stacked.
  • Only halo velocity
  • Filament velocity subtracted.
• Next week
  • New filaments on the background filaments (for check)
  • Why theta > 90 degree at earlier epoch (which means it's going away from the filaments)?
  • Filament velocity distribution

4 Seyeon's Report - CLML

Speaker: Se Yeon Hwang (Universe of Seoul)

Cosmology with Large scale structure using Machine Learning (CLML)

• Our admission process is ungoing.
• We think it will be finished next week.
• We are testing ViT with new simulation.
• We also need to reduce time taken to create galaxies catalog.

5 Sumi's report

Speaker: Sumi Kim (University of Seoul)

Cosmology of High-Order Statistics (CHOA)

• Read this paper: Statistical Properties of Paired Fixed Fields

6 Dr.Sabiu's Report

Speaker: Dr Cristiano Sabiu (University of Seoul)

Deep Learning the Deep Sky: Recovering low surface brightness objects with machine learning

• No progress

7 Discussion