Axions in Japan

Session

Parallel session - Pheno I

10 Nov 2025, 15:30

Lecture Hall (Kavli IPMU)

9. Background-Enhanced Axion Force by Axion Dark Matter

Yu Cheng

10/11/2025, 15:30

In this talk, I will discuss the impact of axion dark matter on spin-independent forces between nucleons. Our study shows that when the axion dark matter background is taken into account, the axion-mediated force changes its distance dependence from 1/r^3 to 1/r, and its magnitude is significantly enhanced proportionally to the axion number density. This amplification allows fifth-force...

10. Electric Dipole Moments From Missed Dark Matter Scattering

Jason L. Evans

10/11/2025, 15:50

Axion-like particles are a well-motivated candidate for ultralight dark matter. Because dark
matter must be non-relativistic, the effects of its scattering with Standard Model particles are
negligible and generally go unnoticed. However, due to the large occupation number of ultralight
dark matter, the sum of all scatterings leads to a classical field-like interaction with Standard...

11. Constraints on MeV Axion Models from Kaon Decays with KTeV Data

Takaya Iwai

10/11/2025, 16:10

The QCD axion is a compelling mechanism for solving the strong CP problem. Most studies have
focused on axion models with a large decay constant, (f_a
\gtrsim10^9 GeV). However, recent work has pointed out that viable axion models may also exist
for (f_a\sim1 GeV). In our research, we derive stringent constraints on this axion scenario from kaon
decay measurements.

12. Search for sub-eV ALP via quasi-parallel stimulated resonant photon collision with “coronagraphy” to mitigate background photon based on spatial distribution characteristics

Airi Kodama

10/11/2025, 16:30

The identity of dark matter (DM) remains one of the major mysteries of modern physics.
The QCD axion, arising from the Peccei-Quinn mechanism that solves the strong CP
problem, is a well-motivated low-mass DM candidate.
The SAPPHIRES collaboration searches for the QCD axion and axion-like particles
(ALPs) using two-color, high-intensity, short-pulse lasers [1]. Our approach targets...