CPLUOS Astrophysics team meeting

Friday 24 Feb 2023, 14:00 → 15:20 Asia/Seoul

물리학과

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

COSMOLOGY

1 Hyeonmo's Report - PyUltraLight2=PyUltraLight + N-body Particles

Speaker: Hyeonmo Koo (University of Seoul)

20230223.pptx

Planar System Generation

• PyUltraLight (PyUltra = n-body)
  • Fuzzy dark matter
  • Add n-body particle code.
• Use 'Sponge boundary condition.'
• We can trust this code.
• Test: Put 1 particle for each fuzzy dark matter halo in our previous work.
  • For M_FDM:M_particle = 6:4
  • For M_FDM:M_particle = 99:1 → It's easy to separate from the beginning.
• Final-parsec problem → Black holes merge quickly.
  • M_bh = 10⁶~10⁷ kg

2 Young's report. FoF and MST algorithm

Speaker: Young Ju

FoF and MST algorithm

• No progress

3 Hannah's Report

Speaker: Hannah Jhee (University of Seoul)

Active Galactic Nucleus (AGN)-Merger Connectivity

• There are filaments, and the halos spin.
  • What do we get?
  • What is the ultimate goal?
• Filaments → Distance? ← Observer
• Robustness evolution
  • Robustness = How high is the density than the surrounding area?
  • z (Redshift) = 0.3: The big changes
  • log R-z (Redshift) graph
• Persistence diagram
  • Value-persistence graph
    • Pair calculation
    • Difference in density between two pairs
• Horizon-active galactic nucleus simulation
  • Find gas filaments, not galaxy filaments.
• Check the safety of filaments.
• Filaments: Filaments connect nodes and nodes.
• Topology → The angle?
• The connectivity of clusters is being studied.
• Nodes → Average number of filaments → Calculate mathematically (A few calculations) → Comparison ← Observations

4 Seyeon's Report - CLML

Speaker: Se Yeon Hwang (Universe of Seoul)

Cosmology with Large scale structure using Machine Learning (CLML)

• No progress

5 Sumi's report

Speaker: Sumi Kim (University of Seoul)

Cosmology of High-Order Statistics (CHOA) & Dark Energy Spectroscopic Instrument (DESI)

• 2pcf comparison of modified gravity parameter
  • r [Mpc/h]-ξ*r*r graph
• 2pcf comparison of Brans-Dicke parameter
  • W_BD = 40000
  • W_BD = 39000
  • W_BD = 38000
  • W_BD = 37000
  • W_BD = 36000
• Use ROCKSTAR → Satellite halos mass function graph
  • log10M-log10dn/dlog10M graph
    • Draw a histogram.
  • One point = One galaxy
  • 8.5 ~ 9.0: There are the largest number of galaxies.

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