SLAC-2017:Discussion on next steps for Cluster and high ell science

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Notes from session

(1) Measuring the growth rate of structure with clusters (sigma_8(z)) as an independent probe of dark energy, gravity and neutrino physics. Measure G(z) to 1 % (?) over redshift of 0 < z< 2 (unique capability: z >1.5; mass calibration)- number of clusters. (SWA Comment: Suggest that we emphasize z>1.5 science and aim to extend measurements to z~3, when massive clusters first formed. Also suggest we aim for ~1% mass calibration from CMB lensing in each z bin to match LSST target at lower-z).

(2) Identify populations of high redshift groups and clusters to identify targets for studying galaxy formation (SWA note: z>2 objects likely to be the prime targets, reaching out to epoch when much star formation and AGN activity peaks).

(3) Tracing the projected electron distribution, the pressure distribution and the matter distribution of the universe. By cross-correlating with other surveys, we can measure the correlation between electrons, pressure and matter and the tracer population of galaxies or quasars

(4) KSZ as tracer of growth rate of structure

(5) reionization: high l kSZ power spectrum and 4-point function

(6) Solar System: detect Uranus-class planets in outer solar system; asteroids?

(7) Transients

(8) Faraday rotation

(9) Cosmic bireferengence

(10) Measure local quadrupole