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BEGIN:VEVENT
SUMMARY:Seminar\, Ziwen Yin (TDLI)
DTSTART;VALUE=DATE-TIME:20260730T043000Z
DTEND;VALUE=DATE-TIME:20260730T053000Z
UID:127391149246
DESCRIPTION:Titile :\nProbe exotic energy injection from dark sectors thro
 ugh cosmic reionization\n\nAbstract :\nAxions and primordial black holes (
 PBHs) are well-motivated dark matter candidates that can inject energy int
 o the intergalactic medium (IGM) via decay or evaporation over cosmic hist
 ory\, leaving imprints on the cosmic microwave background (CMB). In recent
  work\, we have derived a model-independent ionization history after recom
 bination from CMB power spectra using a Gaussian process approach\, allowi
 ng new physics to be constrained directly from the high-redshift optical d
 epth. Applying this framework\, we investigate the decay of multi-string a
 xions and place the first constraints on the corresponding geometrical par
 ameter space. We also compute the redshift-dependent energy injection from
  Hawking evaporation using BlackHawk\, we obtain upper limits on the initi
 al PBH abundance that are robust against reionization modeling uncertainti
 es and systematically more conservative than existing bounds. Our results 
 demonstrate the power of reionization observables as a precise probe of PB
 H evaporation and other late-time energy-injection scenarios.
LOCATION:721
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