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

We investigate the observational constraints on the cosmic neutrinobackground (CNB) given by the extended $\Lambda$CDM scenario ($\Lambda$CDM $+N_{\rm eff} + \sum m_{\nu} + c^2_{\rm eff} + c^2_{\rm vis} + \xi_{\nu}$) usingthe latest observational data from \textit{Planck} CMB (temperature powerspectrum, low-polarisation and lensing reconstruction), baryon acousticoscillations (BAOs) , the new recent local value of the Hubble constantfrom\textit{ Hubble Space Telescope} (\textit{HST}) and information of theabundance of galaxy clusters (GCs). We study the constraints on the CNBbackground using CMB + BAO + \textit{HST} data with and without the GC data. Wefind $\Delta N_{\rm eff} = 0.614 \pm 0.26$ at 68 per cent confidence level whenthe GC data are added in the analysis. We do not find significant deviation forsound speed in the CNB rest frame. We also analyze the particular case$\Lambda$CDM $+ N_{\rm eff} + \sum m_{\nu} + \xi_{\nu}$ with the observationaldata. Within this scenario, we find $\Delta N_{\rm eff} = 0.60 \pm 0.28$ at 68per cent confidence level. In both the scenarios, no mean deviations are foundfor the degeneracy parameter.

Probing the properties of relic neutrinos using the cosmic microwave background, the Hubble Space Telescope and galaxy clusters