Impact of reionization on CMB polarization tests of slow-roll inflation

Details Impact of reionization on CMB polarization tests of slow-roll inflation Impact of reionization on CMB polarization tests of slow-roll inflation

2007-10-23

arxiv.org/abs/0710.4162v1

Phys.Rev.D77:043506,2008

Astronomy and Astrophysics

Astrophysics

9 pages, 6 figures; submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.043506

Estimates of inflationary parameters from the CMB B-mode polarization spectrum on the largest scales depend on knowledge of the reionization history, especially at low tensor-to-scalar ratio. Assuming an incorrect reionization history in the analysis of such polarization data can strongly bias the inflationary parameters. One consequence is that the single-field slow-roll consistency relation between the tensor-to-scalar ratio and tensor tilt might be excluded with high significance even if this relation holds in reality. We explain the origin of the bias and present case studies with various tensor amplitudes and noise characteristics. A more model-independent approach can account for uncertainties about reionization, and we show that parametrizing the reionization history by a set of its principal components with respect to E-mode polarization removes the bias in inflationary parameter measurement with little degradation in precision.

Affiliated with

Also associated with

No associations

Rating

Impact of reionization on CMB polarization tests of slow-roll inflation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Impact of reionization on CMB polarization tests of slow-roll inflation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact of reionization on CMB polarization tests of slow-roll inflation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-455626