Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-12-31
Astrophys.J. 456 (1996) 413-421
Astronomy and Astrophysics
Astrophysics
Changes in the revised version: 1. Below Eq. (2), we demonstrate the method of our numerical work, by adding the evolution equ
Scientific paper
10.1086/176665
We discuss the effect of matter reionization on the large-angular-scale anisotropy and polarization of the cosmic microwave background radiation (CMBR) in the standard CDM model. We separate three cases in which the anisotropy is induced by pure scalar, pure tensor, and mixed metric perturbations respectively. It is found that, if reionization occurs early enough, the polarization can reach a detectable level of sequentially $6\%$, $9\%$, and $6.5\%$ of the anisotropy. In general, a higher degree of polarization implies a dominant contribution from the tensor mode or reionization at high redshift. Since early reionization will suppress small-scale CMBR anisotropies and polarizations significantly, measuring the polarization on few degree scales can be a direct probe of the reionization history of the early universe.
figures 10
latex
Ng Ka Lok
Ng Kin-Wang
pages 19
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