Cosmo‑Astro‑Particle Symposium (CAP 2025) & The 19th TeV Workshop

There is a recent growing interest in detecting gravitational waves (GWs) via lunar seismic measurements. It requires a precise understanding of the Moon’s response to passing GWs but previous studies derived two seemingly different response functions—one using a field-theory approach and the other based on tidal forces—raising questions about their equivalence. Here, we analytically and...

Red giants (RGs) efficiently capture dark matter (DM) through elastic scattering with stellar nuclei. Once accumulated in the helium core, the DM population can become self-gravitating and collapse, injecting energy through scattering and (when relevant) delayed annihilation. This localized heating can trigger a premature helium flash, reducing the luminosity at the tip of the RG branch. By...

We investigate whether collider experiments can reach the quantum limit of precision, defined by the quantum Fisher information (QFI), using only classical observables such as particle momenta. As a case study, we focus on the $\tau^+\tau^-$ system and the decay channel $\tau \to \pi \nu$, which offers maximal spin-analyzing power and renders the decay a projective measurement.
We develop a...

Detecting light dark matter is a frontier challenge requiring a blend of conventional and cutting-edge approaches. Direct detection with low-threshold nuclear or electron recoil detectors, quantum-enhanced sensors, and searches for annihilation or production signatures offer promising avenues. Combining these methods and refining background discrimination will be crucial to uncovering the...

Dark matter is the dominant matter in the Universe while its particle nature is still unknown. In this talk, I will introduce two major scenarios of dark matter: Axion dark matter and WIMP (Weakly Interactive Massive Particle) and show how radio telescopes can search and put constraints on their parameters. The first one is Axion, which is a compelling dark matter candidate of increasing...

When a cosmic fluid, such as relic neutrinos or a minor light dark matter (DM) component, passes by the cold DM halo, it would be focused by the gravitational attraction. Then the fluid density is enhanced on the downwind side. Such cosmic gravitational focusing (CGF) effect can be used to probe the neutrino masses and the fraction of the minor light DM. With galaxy cross correlation that can...

Dark photons, which can kinetically mix with ordinary photons, represent
the simplest extension to the standard model. Detecting their
oscillations with visible photons could provide crucial insights into
the nature of dark matter and fundamental interactions beyond the standard
model. We propose a novel laboratory-based approach to detect dark photon
oscillations using a laser in...

Ref. Phys. Rev. Lett. 134 (2025) 121801
A search is performed for dark matter particles produced in association with a resonantly produced pair of b-quarks with $30 < m_{bb} < 150$ GeV using 140 fb$^{−1}$ of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. This signature is expected in extensions of the Standard Model predicting the...