Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-08-09
Phys.Rev. D55 (1997) 1822-1829
Astronomy and Astrophysics
Astrophysics
19 pages, 12 figures, Revised to match PRD accepeted version. Improved COBE normaliztion so some numerical results change slig
Scientific paper
10.1103/PhysRevD.55.1822
I discuss the physics of polarization in models with early reionization. For sufficiently high optical depth to recombination the polarization is boosted on large scales while it is suppressed on smaller scales. New peaks appear in the polarization power spectrum, their position is proportional to the square root of the redshift at which the reionization occurs while their amplitude is proportional to the optical depth. For standard scenarios the rms degree of linear polarization as measured with a 7 degree FWHM antenna (like the one of the Brown University experiment) is $1.6\mu K$, $1.2 \mu K$, $4.8\times 10^{-2} \mu K$ for an optical depth of 1, 0.5 or 0 respectively. For a 1 degree FWHM antenna this same models give $2.7 \mu K$ , $1.8 \mu K$ and $0.77 \mu K$. Detailed measurement of polarization on large angular scales could provide an accurate determination of the epoch of reionization, which cannot be obtained from temperature measurements alone.
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