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 perform a detailed study of the weak interactions of standard modelneutrinos with the primordial plasma and their effect on the resonantproduction of sterile neutrino dark matter. Motivated by issues in cosmologicalstructure formation on small scales, and reported X-ray signals that could bedue to sterile neutrino decay, we consider $7$ keV-scale sterile neutrinos.Oscillation-driven production of such sterile neutrinos occurs at temperatures$T \gtrsim 100$ MeV, where we study two significant effects of weakly chargedspecies in the primordial plasma: (1) the redistribution of an input leptonasymmetry; (2) the opacity for active neutrinos. We calculate theredistribution analytically above and below the quark-hadron transition, andmatch with lattice QCD calculations through the transition. We estimateopacities due to tree level processes involving leptons and quarks above thequark-hadron transition, and the most important mesons below the transition. Wereport final sterile neutrino dark matter phase space densities that aresignificantly influenced by these effects, and yet relatively robust toremaining uncertainties in the nature of the quark-hadron transition. We alsoprovide transfer functions for cosmological density fluctuations with cutoffsat $k \simeq 10 \ h \ {\rm Mpc}^{-1}$, that are relevant to galactic structureformation.

Sterile neutrino dark matter: A tale of weak interactions in the strong coupling epoch