From CMB-S4 wiki
Revision as of 08:04, 5 April 2016 by Dunkley (talk | contribs) (Created page with "===Forecasting non-r parameters=== ====Parameters ==== *LCDM 6-parameters *curvature *running *birefringence *correlated isocurvature amplitude *uncorrelated isocurvature ampli...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigationJump to search

Forecasting non-r parameters


  • LCDM 6-parameters
  • curvature
  • running
  • birefringence
  • correlated isocurvature amplitude
  • uncorrelated isocurvature amplitude
  • cosmic string tension
  • neutrino mass sum
  • Neff
  • Yp
  • neutrino sound speed

  • dark matter annihilation
  • light-axion fraction (Renee Hlozek)
  • w
  • w0,wa
  • f

Codes =

With info on what data they can handle and who is available to run them

  • Errard/Feeney code (Josquin Errard)
  • Allison et al code - primary plus lensing plus cross-correlations plus BAO (Danielle Leonard, Jo Dunkley)
  • Madhavacheril's code (similar to Allison et al) (Mat Madhavacheril)
  • de Bernardis code - includes kSZ likelihood (Francesco de Bernardis)
  • tSZ likelihood?


  • Planck at l<30 over 80% of sky
  • S4 TT/TE/EE/kk over 40% of sky, 30<l < lmax
  • Planck TT/TE/EE from 30<l<2500 over additional 40% of sky
  • Or neglect l<30 TE/EE and use tau prior 0.06+-0.01
  • lmax(TT)=3000 unless explicit foreground cleaning is done in code
  • lmax(TE,EE)=4000 unless explicit foreground cleaning done in code
  • quadratic estimator with iterative delensing
  • Gaussian likelihood neglecting T/E/k covariance is ok, but non-Gaussian better (what codes have that?)


Nominal test case

  • Single channel (e.g. 150 GHz) at 1 uK/amin, 3 arcmin resolution.
  • White noise, no FG inflation
  • Useful if your code can spit out errors as function of noise level in 1-10 uK/arcmin range and resolution in range 1-10 arcmin.

Next steps

  • Define multiple frequencies of the survey
  • Decide if an N_ell that captures non-white-noise is necessary
  • Define residual FG level if any