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SUMMARY:Probing Inflationary Origins of Primordial Black Holes with LIGO-V
 irgo-KAGRA O1-O4a data
DTSTART;VALUE=DATE-TIME:20261024T075000Z
DTEND;VALUE=DATE-TIME:20261024T081000Z
DTSTAMP;VALUE=DATE-TIME:20261025T062426Z
UID:indico-contribution-3016@indico.itp.ac.cn
DESCRIPTION:Speakers: 迈 乔 (中国科学院大学 国际理论物理中
 心（亚太地区）)\nLarge primordial curvature perturbations can produ
 ce primordial black holes (PBHs) and inevitably generate a scalar-induced 
 stochastic gravitational-wave background upon horizon re-entry. In this ta
 lk\, based on our recent work arXiv:2609.12867\, we will present constrain
 ts from the combined LIGO–Virgo–KAGRA O1–O4a data on two representat
 ive inflationary mechanisms for producing such perturbations: ultra-slow-r
 oll inflation and an inflationary phase transition. We find no evidence fo
 r either signal and derive 95% credible upper limits on the curvature-spec
 trum amplitude over the frequency range accessible to ground-based interfe
 rometers. Because PBH abundance depends exponentially on the perturbation 
 amplitude\, even a modest improvement in the amplitude constraint can tran
 slate into orders-of-magnitude stronger limits on PBH formation. The resul
 ting bounds probe PBH abundances far below unity and can surpass conventio
 nal constraints. Importantly\, the gravitational-wave signal preserves inf
 ormation about PBH formation even when the PBHs are too rare for direct se
 arches or have already evaporated. These results demonstrate that stochast
 ic gravitational-wave observations provide a powerful and complementary pr
 obe of small-scale inflationary physics\, with future interferometers exte
 nding the reach to a broader range of inflationary epochs and PBH masses.\
 n\nhttps://indico.itp.ac.cn/event/427/contributions/3016/
LOCATION:
URL:https://indico.itp.ac.cn/event/427/contributions/3016/
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