UMICH-2015: Dark Energy / Gravity / Dark Matter break-out session 2

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Key Science Questions:

  • What are the cosmological constraints on dark energy, modified gravity, and neutrinos from a CMB-S4 SZ cluster survey?
  • What synergies will there be with other multi-wavelength surveys?

Key Instrumental and Systematics Questions:

  • How many clusters (vs mass and redshift) will CMB-S4 detect? How will this vary with beam size, frequency coverage, and depth? Are foregrounds an issue (e.g. sources in clusters)?
  • How well can we calibrate cluster masses? What are the most promising techniques / measurements for reducing uncertainty, and improving cosmological constraints?

Multi-wave Cluster Information:

  • Overlap with X-ray (e.g., eRosita) and optical (e.g., LSST, Euclid, WFIRST) optical surveys
  • Projections for cluster catalog and cosmology for a joint SZ + Optical survey? + X-ray?
  • Need for other follow-up? e.g., How will we confirm and measure redshifts for z = 2 clusters?
  • New constraints enabled by multi-wave overlap (e.g., kSZ); What are they? How well will they constrain cosmology?

Cluster Mass Calibration:

  • CMB cluster lensing; forecasts as a function of beam-size and depth
  • Optical weak lensing from LSST, Euclid, WFIRST; how accurate will we measure masses for a S4 cluster survey?
  • Clustering of clusters


  • Projections for cluster counts for different S4 configurations: What is needed for this?
  • Projections for cosmological constraints: What is needed? What assumptions will we make?