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

Weak gravitational lensing of the cosmic microwave background (CMB) carriesimprints of the physics operating at redshifts much lower than that ofrecombination and serves as an important probe of cosmological structureformation, dark matter physics, and the mass of neutrinos. Reconstruction ofthe CMB lensing deflection field through use of quadratic estimators has provensuccessful with existing data but is known to be sub-optimal on small angularscales ($\ell > 3000$) for experiments with low noise levels. Futureexperiments will provide better observations in this regime, but thesetechniques will remain statistically limited by their approximations. We showthat correlations between fluctuations of the large-scale temperature gradientpower of the CMB sourced by $\ell < 2000$, and fluctuations to the localsmall-scale temperature power reveal a lensing signal which is prominent ineven the real-space pixel statistics across a CMB temperature map. We presentthe development of the Small Correlated Against Large Estimator (SCALE), anovel estimator for the CMB lensing spectrum which offers promisingcomplementary analysis alongside other reconstruction techniques in thisregime. The SCALE method computes correlations between both thelarge/small-scale temperature gradient power in harmonic space, and it is ableto quantitatively recover unbiased statistics of the CMB lensing field withoutthe need for map-level reconstruction. SCALE can outperform quadratic estimatorsignal-to-noise by a factor of up to 1.5 in current and upcoming experimentsfor CMB lensing power spectra $C_{6000<L<8000}^{\phi\phi}$.

Small Correlated Against Large Estimator (SCALE) for Cosmic Microwave Background Lensing