Dark matter and black holes

Session

Contributed talks

Dec 4, 2025, 3:30 PM

Lecture Hall (Kavli IPMU)

Conveners

Contributed talks

• Chair: Jianing Wang

232. Primordial black holes from inflation and their observational imprints (online)

Rajeev Kumar Jain

12/4/25, 3:30 PM

Primordial black holes (PBH) have recently emerged as a very interesting candidate for the cold dark matter in the universe. We study their generation in a single field inflationary model with an inflection point potential and found that PBHs can be produced in our scenario in the asteroid-mass window with a nearly monochromatic mass fraction, accounting for the total dark matter in the...

231. The trichotomy of PBH initial conditions

Laia Montellà

12/4/25, 3:50 PM

We show that the threshold to form a black hole, in an asymptotically flat and radiation dominated Friedman-Robertson-Walker (FRW) Universe, is not solely (mainly) determined by the behaviour of the compaction function at its maximum, as earlier thought, but also by the three-dimensional curvature at smaller (but super-horizon) scales, which we call "the core". We find three classes of initial...

233. Primordial black hole formation from the merger of oscillons

Naoya Kitajima

12/4/25, 4:10 PM

We show that the merger of oscillons results in a broad spectrum of the oscillon mass. A huge number of oscillon samples obtained from numerical lattice simulations reveal that the oscillon mass distribution has an exponential tail in a heavy-mass region. This enables us to infer the fractional abundance of heavy oscillons. Using the criterion for the primordial black hole (PBH) formation from...