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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This paper focuses on cosmological constraints derived from analysis of WMAPdata alone. A simple LCDM cosmological model fits the five-year WMAPtemperature and polarization data. The basic parameters of the model areconsistent with the three-year data and now better constrained: Omega_b h^2 =0.02273+-0.00062, Omega_c h^2 = 0.1099+-0.0062, Omega_L = 0.742+-0.030, n_s =0.963+0.014- 0.015, tau = 0.087+-0.017, sigma_8 = 0.796+-0.036. With five yearsof polarization data, we have measured the optical depth to reionization,tau>0, at 5 sigma significance. The redshift of an instantaneous reionizationis constrained to be z_reion = 11.0+-1.4 with 68% confidence. This excludes asudden reionization of the universe at z=6 at more than 3.5 sigma significance,suggesting that reionization was an extended process. Using two methods forpolarized foreground cleaning we get consistent estimates for the opticaldepth, indicating an error due to foreground treatment of tau~0.01. Thiscosmological model also fits small-scale CMB data, and a range of astronomicaldata measuring the expansion rate and clustering of matter in the universe. Wefind evidence for the first time in the CMB power spectrum for a non-zerocosmic neutrino background, or a background of relativistic species, with thestandard three light neutrino species preferred over the best-fit LCDM modelwith N_eff=0 at >99.5% confidence, and N_eff > 2.3 (95% CL) when varied. Thefive-year WMAP data improve the upper limit on the tensor-to-scalar ratio to r< 0.43 (95% CL), for power-law models. With longer integration we find noevidence for a running spectral index, with dn_s/dlnk = -0.037+-0.028.

Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data