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Data-constrained reionization and its effects on cosmological parameters · Around

2011

Data-constrained reionization and its effects on cosmological parameters

Pandolfi, Stefania, Ferrara, Andrea, Choudhury, T. Roy et al.

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We perform an analysis of the recent WMAP7 data considering physically motivated and viable reionization scenarios with the aim of assessing their effects on cosmological parameter determinations.

The main novelties are: (i) the combination of CMB data with astrophysical results from quasar absorption line experiments; (ii) the joint variation of both the cosmological and astrophysical [governing the evolution of the free electron fraction x_e(z)] parameters.
Including a realistic, data-constrained reionization history in the analysis induces appreciable changes in the cosmological parameter values deduced through a standard WMAP7 analysis.
Particularly noteworthy are the variations in Omega_bh^2 = 0.02258^{+0.00057}_{-0.00056} (WMAP7) vs.

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Choudhury, T. R. and Ferrara, A. (2006) Monthly Notices of the Royal Astronomical Society, 371, L55
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