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

Weak gravitational lensing of the CMBR manifests as a secondary anisotropy inthe temperature maps. The effect, quantified through the shear and convergencefields imprint the underlying large scale structure (LSS), geometry andevolution history of the Universe. It is hence perceived to be an importantobservational probe of cosmology. De-lensing the CMBR temperature maps is alsocrucial for detecting the gravitational wave generated B-modes. Futureobservations of redshifted 21-cm radiation from the cosmological neutralhydrogen (HI) distribution hold the potential of probing the LSS over a largeredshift range. We have investigated the correlation between post-reionizationHI signal and weak lensing convergence field. Assuming that the HI follows thedark matter distribution, the cross-correlation angular power spectrum at amultipole \ell is found to be proportional to the cold dark matter powerspectrum evaluated at \ell/r, where r denotes the comoving distance to theredshift where the HI is located. The amplitude of the ross-correlation dependson quantities specific to the HI distribution, growth of perturbations and alsothe underlying cosmological model. In an ideal ituation, we found that astatistically significant detection of the cross-correlation signal ispossible. If detected, the cross-correlation signal hold the possibility of ajoint estimation of cosmological parameters and also test various CMBRde-lensing estimators.

CMBR Weak Lensing and HI 21-cm Cross-correlation Angular Power Spectrum