Is there another coincidence problem at the reionization epoch?
نویسندگان
چکیده
منابع مشابه
How is the Reionization Epoch Defined ?
We study the effect of a prolonged epoch of reionization on the angular power spectrum of the Cosmic Microwave Background. Typically reionization studies assume a sudden phase transition, with the intergalactic gas moving from a fully neutral to a fully ionized state at a fixed redshift. Such models are at odds, however, with detailed investigations of reionization, which favor a more extended ...
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We consider the pumping of the 63.2 mm fine-structure line of neutral O i in the high-redshift intergalactic medium (IGM), in analogy with the Wouthuysen-Field effect for the 21 cm line of cosmic H i. We show that the soft UV background at ∼1300 can affect the population levels, and if a significant fraction of the IGM volume is filled Å with “fossil H ii regions” containing neutral O i, then t...
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The recent observations of cross temperature-polarization power spectra of the Cosmic Microwave Background (CMB) made by the WMAP satellite are in better agreement with a high value of the Thomson scattering optical depth τ ≈ 0.17. This value is close to τ = 0.3, which is taken as the upper limit in the parameter extraction analysis made by the WMAP team. However, models with τ ∼ 0.3 provide a ...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2017
ISSN: 2470-0010,2470-0029
DOI: 10.1103/physrevd.96.123505