Unveiling the cosmological information beyond linear scales: forecasts
  for sufficient statistics
  Beyond the linear regime, Fourier modes of cosmological random fields become
correlated, and the power spectrum of density fluctuations contains only a
fraction of the available cosmological information. To unveil this formerly
hidden information, the A* non-linear transform was introduced; it is optimized
both for the nonlinearities induced by gravity and observational noise.
Quantifying the resulting increase of our knowledge of cosmological parameters,
we forecast the constraints from the angular power spectrum and that of A* from
l ~ 200 to 3000 for upcoming galaxy surveys such as: the Wide-Field Infrared
Survey Telescope (WFIRST), the Large Synoptic Survey Telescope (LSST), Euclid,
the Hyper Suprime-Cam (HSC) and the Dark Energy Survey (DES). We find that at
low redshifts this new data analysis strategy can double the extracted
information, effectively doubling the survey area. To test the accuracy of our
forecasting and the power of our data analysis methods, we apply the A*
transformation to the latest release of the Canada-France-Hawaii-Telescope
Legacy Survey (CFHTLS) Wide. While this data set is too sparse to allow for
more than modest gains (~1.1-1.2), the realized gain from our method is in
excellent agreement with our forecast, thus verifying the robustness of our
analysis and prediction pipelines.
