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 present an updated version of the HMcode augmented halo model that can beused to make accurate predictions of the non-linear matter power spectrum overa wide range of cosmologies. Major improvements include modelling of BAOdamping in the power spectrum and an updated treatment of massive neutrinos. Wefit our model to simulated power spectra and show that we can match the resultswith an RMS error of 2.5 per cent across a range of cosmologies, scales $k <10\,h\mathrm{Mpc}^{-1}$, and redshifts $z<2$. The error rarely exceeds 5 percent and never exceeds 16 per cent. The worst-case errors occur at $z\simeq2$,or for cosmologies with unusual dark-energy equations of state. This representsa significant improvement over previous versions of HMcode, and over otherpopular fitting functions, particularly for massive-neutrino cosmologies withhigh neutrino mass. We also present a simple halo model that can be used tomodel the impact of baryonic feedback on the power spectrum. This six-parameterphysical model includes gas expulsion by AGN feedback and encapsulates starformation. By comparing this model to data from hydrodynamical simulations wedemonstrate that the power spectrum response to feedback is matched at the $<1$per cent level for $z<1$ and $k<20\,h\mathrm{Mpc}^{-1}$. We also present asingle-parameter variant of this model, parametrized in terms of feedbackstrength, which is only slightly less accurate. We make code available for ournon-linear and baryon models at https://github.com/alexander-mead/HMcode and itis also available within CAMB and soon within CLASS.

HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback