Dark matter and black holes

Session

Contributed talks

5 Dec 2025, 11:20

Lecture Hall (Kavli IPMU)

Conveners

Contributed talks

• Chair:

235. Discovery of a Little Red Dot candidate at z ~ 10

Takumi Tanaka

05/12/2025, 11:20

Deep IR observations by JWST have discovered a new population of high-redshift compact objects known as "little red dots" (LRDs) with a characteristic V-shape SED. Based on the detection of broad Balmer emission lines, previous studies suggested that LRDs are low-luminosity AGNs, possibly linked to super-Eddington accretion shortly after seed BH formation. In this study, we propose a new color...

236. Neutrino signals from Dark Stars seeding SMBHs

Thomas Schwemberger

05/12/2025, 11:40

Dark Stars (DS), powered by dark matter annihilation may form in the place of Pop. III stars. They can grow to $\gtrsim 10^5~M_\odot$ and collapse to black holes making them excellent candidates to seed supermassive black holes. We establish first constraints on DSs as SMBH progenitors based on DM annihilations using data from Super-Kamiokande and IceCube neutrino experiments, while remaining...

237. Revisiting the merger rate of primordial black holes

Shunsuke Neda

05/12/2025, 12:00

The merger rate of binary black holes inferred by the LIGO-Virgo-KAGRA (LVK) collaboration is potentially compatible with primordial black holes (PBHs). Reexamining the latest merger rate calculations for Poisson-distributed PBHs, we find that they did not fully implement the binary formation conditions required for PBH pairs to decouple from the Hubble flow. Once these conditions are properly...