CPLUOS Astrophysics team meeting

Monday 1 Nov 2021, 16:30 → 17:55 Asia/Seoul

물리학과

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

COSMOLOGY

1 Dr.Sangnam Park's Report - FDM_Offset

Speaker: Sangnam Park

2 Hyeonmo's report - CDM Halo Evolution for Gadget2 Simulation

Speaker: Hyeonmo Koo (University of Seoul)

• CDM Halo Evolution for Gadget2 Simulation
  • (M/50)V graph's peak is 5.
  • Initial Velocity [28.184km/s] - Velocity Decrease [28.184km/s]
    • 3 bump
      • (22, 3.0)
      • (28, 2.0)
      • (43, 0.8)
  • Why does FDM's oscillation occur?
    • Because it's unique time scale in FDM.

3 Young's report. FoF and MST algorithm

Speaker: Young Ju

• FoF and MST algorithm
  • Random + Noise data
    • Now the number of galaxies in cluster follows the exponential distribution.
    • The minimum number = 1
    • The maximum number = 307
    • Total number of galaxies = 4541
    • Number of galaxy - Number graph
      •  It looks like stairways and it decreases.
  • Noise = 5k
    • (min_number, MGS, MST, DBSCAN, Hierarchical)
    • (3, 586, 253, 41, 253)
    • (10, 136, 66, 41, 66)
    • (20, 50, 40, 35, 40)
    • (50, 35, 22, 30, 22)
  • Noise = 50k
    • (min_number, MGS, MST, DBSCAN, Hierarchical)
    • (3, 550, 1, 1, 1)
    • (10, 525, 1, 1, 1)
    • (20, 494, 1, 1, 1)
    • (50, 347, 1, 1, 1)
  • Test FoF on random + noise data : noise = 5000
    • It is similar result with MST but this one is more bad clustering.
    • In MST, what does the multicoloredness mean than FoF?
      • Because of order.

4 CHOA(Cosmology of High-Order Statistics)

Speaker: Se Yeon Hwang

• CHOA(Cosmology of High-Order Statistics)
  • Unfinished research paper related to Baryon oscillations.

5 Dr.Sabiu's Report

Speaker: Dr Cristiano Sabiu (University of Seoul)

6 Discussion