Workshop on Very Light Dark Matter 2023

Session

Morning session-2

29 Mar 2023, 11:10

Mario Royal Kaikan (Chino, Nagano) + Online

Conveners

Morning session-2

• Naoya Kitajima

Morning session-2

• Yuta Michimura

2. The viability of ultralight bosonic dark matter in dwarf galaxies

Isabelle Goldstein

29/03/2023, 11:10

The dark matter distribution in dwarf galaxies holds a wealth of information on the fundamental properties and interactions of the dark matter particle. We study whether ultralight boson dark matter is consistent with the gravitational potential extracted from stellar kinematics. We use velocity dispersion measurements from six classical dwarf galaxies to show that axion-like particles with...

4. Continuous gravitational waves from self-interacting axion condensate

Hidetoshi Omiya

29/03/2023, 11:30

Ultra-light particles, such as axions, form a macroscopic condensate around a highly spinning black hole by the superradiant instability. The condensate emits characteristic gravitational waves, such as a monochromatic gravitational wave. The characteristic gravitational waves open the possibility of detecting the axion through gravitational wave search. However, the precise evolution of the...

16. Evolution of binary systems accompanying axion clouds in extreme mass ratio inspirals

Takuya Takahashi

29/03/2023, 11:50

Axions can form a cloud around a rotating black hole (BH) by the superradiant instability. We expect to be able to explore axions from gravitational waves (GWs) from binary BHs. In particular, when the BH with a cloud belongs to a binary system, the resonant phenomenon occurs during the inspiral phase. We study the evolution of binary systems accompanying the axion cloud around the resonance...

17. Quantum Nucleation of Chiral Soliton Lattice

Kohei Kamada

29/03/2023, 12:10

The Chiral Soliton Lattice (CSL) is a lattice structure composed of pion or axion domain walls aligned in parallel at equal intervals, which is energetically stable in the presence of a background magnetic field and a finite (baryon) chemical potential due to the topological term originated from the chiral anomaly. In this talk, I will discuss how to describe its formation by the quantum...

32. First Results of DANCE from Long-Term Observation

Yuka Oshima

30/03/2023, 10:50

Axions are one of the well-motivated candidates for dark matter, originally proposed to solve the strong CP problem in particle physics. Dark matter Axion search with riNg Cavity Experiment (DANCE) is a new experimental project to search for axion dark matter. We aim to detect the rotation and oscillation of optical linear polarization caused by axion-photon coupling with a bow-tie cavity....

33. Recent Upgrades of Optical System and Data Analysis in DANCE

Hiroki Fujimoto

30/03/2023, 11:10

24. Light dark matter around eV mass range

Wen Yin

30/03/2023, 11:30

I will talk about dark matter in eV mass range such as the experimental hints, future reaches, and dark matter theory.