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 consider the dark matter (DM) scenarios consisting of the mixture of WIMPsand PBHs and study how much fraction of the total DM can be PBHs. In suchscenarios, PBHs can accrete the WIMPs and consequently enhance the heating andionization in the intergalactic medium due to WIMP annihilations. Wedemonstrate that the CMB data can give the stringent bounds on the allowed PBHfraction which are comparable or even tighter than those from the gamma raydata depending on the DM masses. For instance, the MCMC likelihood analysisusing the Planck CMB data leads to the bound on PBH DM fraction with respect tothe total dark matter $f_{\rm PBH} \lesssim {\cal O}( 10^{-10}\sim 10^{-8})$for the WIMP mass $m_{\chi}\sim {\cal O}(10\sim 10^3)$ GeV with theconventional DM annihilation cross section $\langle \sigma v \rangle=3 \times10^{-26}~\rm cm^3/s $. We also investigate the feasibility of the global 21-cmsignal measurement to provide the stringent constraints on the PBH fraction.

Constraining Mixed Dark-Matter Scenarios of WIMPs and Primordial Black Holes from CMB and 21-cm observations