Primordial Helium Abundance from CMB: a constraint from recent observations and a forecast
Abstract
We studied a constraint on the primordial helium abundance Yp from current and future observations of CMB. Using the currently available data from WMAP, ACBAR, CBI and BOOMERANG, we obtained the constraint as Yp = 0.25+0.10-0.07 at 68% C.L. We also provide a forecast for the Planck experiment using the Markov chain Monte Carlo approach. In addition to forecasting the constraint on Yp, we investigate how assumptions for Yp affect constraints on the other cosmological parameters.
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