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Axions in Japan

10–14 Nov 2025
Kavli IPMU
Asia/Tokyo timezone

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Session

Parallel session - Cosmology I

10 Nov 2025, 14:00
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

Parallel session - Cosmology I

  • Chair: Dan Kondo

Presentation materials

There are no materials yet.

  1. 3. Multi-Axion Bosenovae and Sequential Axion Emissions
    Jason Arakawa
    10/11/2025, 14:00

    Axion particles can form gravitationally bound condensates known as axion stars. In the presence of self-interactions their collapse can trigger axion bosenovae — transient events accompanied by bursts of relativistic particle emission. We investigate such phenomena in systems composed of multiple axion fields, which can arise in various extensions of the Standard Model. Using both variational...

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  2. 4. Core–Halo Relation in Self-Interacting Scalar Field Dark Matter
    Jessica N. Lopez-Sanchez
    10/11/2025, 14:20

    In this talk, I will explore the phenomenology of scalar field dark matter with both attractive and repulsive self-interactions. Using idealized simulations, I analyze the properties of halo cores across a wide range of interaction strengths, from the strongly attractive regime to the Thomas–Fermi limit. The numerical results are compared with analytical predictions for the core mass–size...

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  3. 5. Interfering and Interacting Fuzzy Dark Matter
    Christian Capanelli
    10/11/2025, 14:40

    In the standard Fuzzy Dark Matter (FDM) scenario, the dark matter is composed of an ultra-light scalar field with coherence length and wave interference on astrophysical scales. However, scalar fields generically have quartic self-interactions that modify their dispersion relation and the associated evolution of density perturbations. I will begin by presenting the first dedicated analysis of...

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