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DTSTART;TZID=Europe/Madrid:20260224T150000
DTEND;TZID=Europe/Madrid:20260224T160000
DTSTAMP:20260406T015606
CREATED:20260129T125218Z
LAST-MODIFIED:20260219T111953Z
UID:24306-1771945200-1771948800@www.ift.uam-csic.es
SUMMARY:Seminar: Primordial black holes from Q-balls
DESCRIPTION:Speaker: Shunsuke Neda (ICRR\, Univ. of Tokyo) \nVenue & Time: Red Room / 15:00 \nTitle: Primordial black holes from Q-balls \nAbstract:  \nWe discuss primordial black holes (PBHs) originating from Q-balls\, which are non-topological solitons arising in complex scalar field theories with a global U(1) symmetry. Depending on the cosmic expansion history\, Q-balls can source PBH formation in both early matter-dominated (eMD) and radiation-dominated (RD) universes\, leading to distinct phenomenological consequences. \nIn the eMD scenario\, PBHs produced from Q-balls can account for the observed dark matter abundance\, and we summarize the resulting cosmological constraints. In contrast\, some scenarios of PBHs formed in a radiation-dominated universe exhibit strong PBH clustering. When motivated as seeds of supermassive black holes\, their abundance and spatial distribution are observationally constrained by isocurvature perturbations. For stellar-mass PBHs relevant to LIGO-Virgo-KAGRA\, we compute PBH merger rates in the presence of initial PBH clustering using updated methodologies. \nThis seminar illustrates how PBHs from Q-balls link particle physics models to cosmological\, astrophysical\, and gravitational-wave observations across multiple mass scales.
URL:https://www.ift.uam-csic.es/event/seminar-primordial-black-holes-from-q-balls/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
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