We propose a natural framework for interacting dark matter and dark energy based on axion–monopole dynamics in a dark gauge sector. Dark matter is composed of dark ’t Hooft–Polyakov monopoles, while dark energy is an ultralight axion whose coupling to the dark gauge field induces an axion-dependent dyon mass through the Witten effect. This generates a direct dark matter–dark energy...
In this contribution, we investigate a supersymmetric effective extension of axionic electrodynamics by adopting the superspace/superfield approach. Rather than focusing on UV-complete axion models, our goal is to analyze how supersymmetry modifies the dynamical and propagating sectors of axion electrodynamics at the effective-field-theory level. In terms of component fields, the resulting...
We propose a novel asymmetric sensitive spin wave interferometer to detect ultralight axion dark matter, which modulates spin wave properties through a weak effective magnetic field in ferromagnets. By splitting a spin wave source into two paths of different lengths and setting them to interfere destructively, the interferometer converts the axion induced phase shift into a measurable...
Ultralight bosonic fields can undergo exponential amplification around rotating black holes through black hole superradiance. This process can result in black hole spin-down, continuous gravitational-wave emission, and many other observable consequences, providing a powerful probe of dark particles in the strong-gravity regime. In particular, the LVK Collaboration has placed constraints on...
Axion and axion-like particles (ALPs), predicted in various extensions of the Standard Model, can be abundantly produced in nuclear reactors via the Primakoff process. In this work, we explore the detection of ALPs in silicon detectors through plasmon excitations. Owing to their relativistic nature, reactor-produced ALPs can efficiently excite plasmon resonances, while the accompanying...
Constraints on axions from neutrino experiments
We introduce the basics and recent developments of cosmological collider physics and cosmological correlators, with an emphasis on their applications to axions.
Axions are considered a key component of dark matter, characterized by very weak couplings to fermions and Chern-Simons couplings to gauge fields. We propose a novel detection mechanism based on symmetry-breaking magnetoelectric materials with a linear axionic coupling between magnetization and ferroelectric polarization. The focus is on a strain gradient $\text{Sr}_2\text{IrO}_4$ film, where...
We analyse phenomenological signatures of Kalb-Ramond-like particles, described by an antisymmetric rank-2 tensor, when coupled to fermionic matter. The latter is modelled by a tensor current coupled directly to the Kalb-Ramond field or by a pseudovector current coupled to the rank-1 dual of the field-strength tensor. We obtain limits on the coupling constants to fermions and mass of the...
The axion, a theoretically well-motivated particle, has been searched for extensively via its hypothetical interactions with ordinary matter and fields. In this talk, an axion detection approach utilizing the ultra-intense electromagnetic fields produced by laser–plasma interactions will be reported. We have developed particle-in-cell (PIC) simulation method that incorporates the axion field,...
We present a diagrammatic framework for radiative Majoron potentials induced by an explicit Majorana mass $M$. Classifying one-loop diagrams by the number of fermion-number-violating ($N_{\rm FNV}$) and fermion-number-preserving ($N_{\rm FNP}$) propagators yields a heavy-mass scaling rule: pure FNV amplitudes behave as $M^{4-n}$, while mixed diagrams receive additional suppression from...
The PKMu experiment uses a resistive plate chamber (RPC) muon tomography system to study cosmic-ray scattering as a probe of both secondary cosmic-ray composition and new physics. During a 63-day data-taking campaign, 1.18 million scattering events were recorded and analyzed. Template fits to the scattering-angle distribution enable precise measurements of secondary cosmic-ray components,...
Self-interacting dark matter turns the structure of galactic halos into a direct requirement on a low-energy scattering amplitude. We show that, for weakly coupled scalar dark matter, this requirement implies a much stronger mass bound on the dark matter particle than partial-wave unitarity alone. Using analyticity, crossing symmetry, locality and partial-wave unitarity, we compute the maximal...
BULLKID-DM is a cryogenic experiment designed for direct detection of WIMP-like dark matter particles with a mass below 1 GeV/c$^{2}$. The detector will consist of a stack of 16 intrinsic silicon wafers, for a total mass of 800 g, that are carved in 2320 active dice with a volume of 5.4$\times$5.4$\times$5 mm$^{3}$. Each die will be instrumented with multiplexed Kinetic Inductance Detectors...
We discuss supernova cooling limits and low-energy supernova constraints on lepton flavor violating axions.
