English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We provide an update on the constraints on extended reionization historieswith the Planck 2018 cosmic microwave background anisotropy data. The Planck2018 data on large angular scales improve the measurement of the $E$-modepolarization reionization bump at low multipoles providing the possibility toimprove our previous results. Using a minor modification to the originalPoly-reion model for the reionization history, we find that the Planck 2018data significantly improve all our previous results: we find as optical depthof $\tau=0.0572_{-0.0075}^{+0.0064}$ at 68% CL, that early onsets ofreionization are strongly disfavoured, i.e. redshift when the reionizationbegins, $z_{xe=0}=18.18_{-10.89}^{+1.61}$ at 68% CL,and that reionizationduration (defined between 10% and 99% reionization) is significantly reduced,i.e. $\Delta_z^{Reion}=4.59_{-2.45}^{+1.67}$ at 68% CL. We explore possiblecorrelations between reionization histories and cosmological parameters,including important extensions beyond $\Lambda$CDM. We find that the degeneracybetween reionization and scalar spectral index,neutrino mass sum, spatialcurvature, dark matter annihilation and other non-standard models aresignificantly reduced.The reduction of the error bars and the degeneracies,together with the shift towards lower values of the optical depth that weobserve in the Poly-reion model are mainly driven by the new low-$\ell$polarization likelihood of Planck 2018 baseline based on the HFI data. This isconfirmed also by the results derived without this likelihood and the ones withdifferent alternatives to the baseline that are presented for a subset ofmodels.

Extended reionization in models beyond $\Lambda$CDM with Planck 2018 data