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

Hawking radiation from primordial black holes (PBH) can ionize and heat upneutral gas during the cosmic dark ages, leaving imprints on the global 21-cmsignal of neutral hydrogen. We use the global 21-cm signal to constrain theabundance of spinning PBHs in mass range of $[2 \times 10^{13}, 10^{18}]$grams. We consider several extended PBH distribution models. Our results showthat 21-cm can set the most stringent PBH bounds in our mass window. Comparedwith constraints set by {\it Planck} cosmic microwave background (CMB) data,21-cm limits are more stringent by about two orders of magnitudes. PBHs withhigher spin are typically more strongly constrained. Our 21-cm constraints forthe monochromatic mass distribution rule out spinless PBHs with initial massbelow $1.5 \times 10^{17}\ \r{g}$, whereas extreme Kerr PBHs with reducedinitial spin of $a_0=0.999$ are excluded as the dominant dark matter componentfor masses below $6 \times 10^{17}\ \r{g}$. We also derived limits for thelog-normal, power-law and critical collapse PBH mass distributions.

21-cm constraints on spinning primordial black holes