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 lensing of the cosmic microwave background is rapidly emerging as apowerful probe of neutrinos, dark energy, and new physics. We present a fastcomputation of the non-linear CMB lensing power spectrum which combinesnon-linear perturbation theory at early times with power spectrum emulationusing cosmological simulations at late times. Comparing our calculation withlightcones from the FLAMINGO 5.6 Gpc cube dark-matter-only simulation, weconfirm its accuracy to 1% (2%) up to multipoles L = 3000 (L = 5000) for anuLambdaCDM cosmology consistent with current data. Clustering suppression dueto small-scale baryonic phenomena such as feedback from active galactic nucleican reduce the lensing power by of order 10%. To our perturbation theory andemulator-based calculation we add SP(k), a new fitting function for thissuppression, and confirm its accuracy compared to the FLAMINGO hydrodynamicsimulations to 4% at L = 5000, with similar accuracy for massive neutrinomodels. We further demonstrate that scale-dependent suppression due toneutrinos and baryons approximately factorize, implying that a carefultreatment of baryonic feedback can limit biasing neutrino mass constraints.

Non-linear CMB lensing with neutrinos and baryons: FLAMINGO simulations vs. fast approximations