CPLUOS Astrophysics team meeting

Monday 13 Dec 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 - FDM vs CDM Halo Collision

Speaker: Hyeonmo Koo (University of Seoul)

• FDM vs CDM Halo Collision
  • In Initial Velocity [28.184km/s] - Velocity Decrease [28.184km/s] graph,
    • 0 ~ 42 : FDM Data is higher than CDM Data
    • 42 ~ : FDM Data and CDM data are similar
  • The Halo with mass M → Scaling of halo with mass M_0 which have initial velocity vM_0/M
    • Here, set the M_0 = 50, drew the graph comparing velocity of before and after collision.

3 Young's report. FoF and MST algorithm

Speaker: Young Ju

• FoF and MST algorithm
  • Check the number of cluster by changing linking-length.
    • Random data : 50 clusters
    • Noise : 5,000
    • In fResolution - Number graph,
      • MGS
        • n total
        • n >= 3
        • n >= 50
    • In Linking - Length graph,
      • FoF
        • n total
        • n >= 3
        • n >= 50

4 CHOA(Cosmology of High-Order Statistics)

Speaker: Sumi Kim (University of Seoul)

• CosKASI Presentation Summary
  • Goal : To extract more information from small scales(~50Mpc)
  • Method : Train some generated simulations with Gaussian Process and using MCMC to recover test simulation parameters.
  • Result : Using 5 kinds of Correlation functions can predicted with few % error at small scales, improving cosmological parameters precision increase with 15 ~ 25%
    • Projected : ω_p(r_p)
    • Monopole : ξ_0(r)
    • Quadrupole : ξ_2(r)
    • Underdensity probability : P_U(r)
    • Marked correlation function : M(r)
• Our progress
  • Considering all possible shapes in 4pcf on our code and working on generalizing issues.

5 Dr.Sabiu's Report - Density Reconstruction

Speaker: Dr Cristiano Sabiu (University of Seoul)

• Density Reconstruction
  • 3-point correlation function - all bins (configurations) → How about draw the graph as 3-D instead 2-D?
  • 4-point correlation function - all bins (configurations)

6 Discussion