King Lau, Jiayu Tang, M. -C. Chu
One of the main goals of modern CMB missions is to measure the tensor-to-scalar ratio r accurately to constrain inflation models. Due to the ignorance of the reionization history X_{e}(z), this analysis is usually done by assuming an instantaneous reionization X_{e}(z), which however can bias the best-fit value of r. Moreover, due to the strong mixing of B-mode and E-mode polarizations in cut-sky measurements, multiplying the sky coverage fraction f_{sky} to the full-sky likelihood would not give satisfactory results. In this work, we make a forecast of the constraints on r for the PLANCK mission taking into account the general reionization scenario and cut-sky effects. Our results show that by applying an N-point interpolation analysis on the reionization history, the bias induced by the instantaneous reionization assumption is removed and the value of r is constrained within 5% error level, if the true value of r is greater than about 0.1 .
View original:
http://arxiv.org/abs/1305.3921
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