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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We investigate the prospects of detecting the cross correlation of CMBRweak-lensing convergence field with the large scale tracers of the underlyingdark matter distribution in the post-reionization epoch. The cross-correlationis then used to make error projections for dark energy equation of state(EoS)for models with a time evolving dark energy. We study thecross-correlation angular power spectrum of the weak-lensing field with theLyman-$\alpha$ forest and the redshifted HI 21 cm signal from the postreionization epoch. The angular power spectra is expressed as a line of sightaverage over the tomographic slices. We find that on using multiple $400$ hrsobservation with an extended uGMRT like instrument or with a BOSS like surveywith quasar (QSO) density of $16 {\rm deg}^{-2}$ the cross-correlation withweak-lensing convergence field covering half the sky can be detected at a veryhigh SNR ($>20$). The cross-correlation of weak-lensing with Lyman-$\alpha$forest allows the $1-\sigma$ errors on the dark energy EoS parameters fordifferent parametrizations to be constrained at a level of precision comparableto combined Planck+SNIa+BAO+HST projections. The 21-cm weak-lensingcross-correlation is found to provide strong constraints on the present valueof the dark energy EoS parameter at $4\%$ for the 7CPL model. The constraintson $w_a$ is comparable ($\sim 12\%$) for models other than the 7CPL model. Wealso find that the CPL parametrization may not be the best constrainedparametrization for dark energy evolution. The cross-correlation of CMBRweak-lensing with the post-reionization probes of neutral hydrogen thus holdsthe potential to give us valuable understanding about the nature of evolvingdark energy.

Constraining dark energy using the cross correlations of weak lensing with post-reionization probes of neutral hydrogen