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Dark matter and black holes

1–5 Dec 2025
Kavli IPMU
Asia/Tokyo timezone

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Session

Contributed talks

4 Dec 2025, 11:20
Lecture Hall (Kavli IPMU)

Lecture Hall

Kavli IPMU

Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8583, Japan

Conveners

Contributed talks

  • Chair: Nivedita Ghosh

Presentation materials

There are no materials yet.

  1. 226. Primordial Black Hole formation from power spectrum with finite width
    Jianing Wang
    04/12/2025, 11:20

    Primordial black holes (PBHs) can form from gravitational collapse of large over-
    densities in the early Universe, giving rise to rich phenomena in astrophysics and cosmology. We develop a novel, general, and systematic method based on theory of density contrast peaks to calculate the abundance of PBHs for a broad power spectrum of curvature perturbations with Gaussian statistics. We...

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  2. 227. When Tiny Halos Stir Spacetime: Gravitational Waves from the Fifth Forces
    Xinpeng Wang
    04/12/2025, 11:40

    Dark matter fermions interacting via attractive fifth forces mediated by a light mediator can form dark matter halos in the very early Universe. Motivated by the scenario, we discovered that the bound systems composed of such halos, even very light, are capable of generating Gravitational Wave (GW) signals detectable today.
    Due to the additional strong force that contributes to the...

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  3. 228. Exploring Ultra-Slow-Roll Inflation in Composite Pseudo-Nambu–Goldstone Boson Models: Implications for Primordial Black Holes and Gravitational Waves
    Marco Merchand Medina
    04/12/2025, 12:00

    We study inflation driven by a scalar potential arising from composite-sector dynamics, inspired by generalized composite Higgs models. The introduction of a non-minimal coupling, possessing the same functional form as the potential, induces a flattening at large field values that enables successful inflation. We analyze the conditions for ultra-slow-roll inflation, which leads to enhanced...

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