[SPRINT] DC2 cluster abundance cosmology

[combet]

[sprint] DC2 cluster abundance cosmology

Run a cluster abundance analysis, using Skysim halos (i.e. no need for a selection function) and a mass-richness relation.

Contacts: Céline Combet, Mariana Penna-Lima Time: All day Main communication channel: #desc-cl-mcp GitHub repo: https://github.com/LSSTDESC/CLCosmo_Sim In-person/Virtual/Hybrid: Hybrid, room ERC 445 for in-person Zoom room (if applicable): DESC CL zoom

Goals and deliverable

The goal is to get sigma8-Omega_m contours by running a cluster count analysis on cosmoDC2/SkySim halos, using a mass-richness relation, where the "richness" is simply the member counts in the halos (no need for a cluster finder or selection function).

Depending on the number and interest of the sprinters, we can do so (a) either using the standalone modules provided by @payerne in the CLCosmo_Sim repo (i.e. those CCL-based modules + e.g., emcee for the MCMC) (b) and/or developing the necessary elements to do the same thing interfacing with DESC tools (i.e. SACC, FireCrown, TJPCov (although might be a bit early for this, see #12 ))

Resources and skills needed

• software, skills:
  • Python
  • for (b) any experience with SACC, FireCrown would be useful. Having the relevant software installed before the sprint would also be good.
  • all are welcome to come and contribute!
• data (what we have):
  • we have pre-extracted halo catalogs and they are available both at NERSC and CC-in2p3
  • @tguillemLSST has provided us with a parametrization of the SkySim/cosmoDC2 mass-"richness" relation (where richness is defined as above), that we can use for that project.

Detailed description

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