Update on Neff Forecasts Joel Meyers with contributions from Dan Green, Alex van Engelen, Matthew Hasselfield, Erminia Calabrese, … August 25, 2017 Harvard CMB-S4 Meeting
Theoretical Motivation CMB-S4 is in a regime where small improvements in the error on Neff lead to vast improvements in the energy scales being probed
Point Sources and Atmosphere
Beam Calibration
Beam calibration is a concern for Neff!
Lensing Noise Dependence ●
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Lensing reconstruction breaks some minor degeneracies with Neff Degradation in the reconstruction (due to e.g. foregrounds) impacts Neff forecasts by up to 30% Delensing also improves constraints when varying both Neff and Yp
Neff Forecasting Update - Summary Point sources and atmosphere have only minor impact on forecasted errors (
