We discuss supernova cooling limits and low-energy supernova constraints on lepton flavor violating axions.
We explore the searches for axion-like particles (ALPs) at the electron-ion collider (EIC) to be built at the Brookhaven National Laboratory. We propose search strategies with the production of diphoton in both coherent (elastic) and inelastic scatterings. We found the EIC embraces the possibility to extend the existing ALP searches.
The microscopic nature of dark matter is the major open question in science. Weakly-Interacting Massive Particles (WIMPs) and Axion-Like Particles (ALPs) are the two most theoretically motivated dark matter candidates. Thousands of papers consider them separately. We point out that if both species are present in the theory, even a tiny (Planck-suppressed) interaction between them could lead to...
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...
Ultralight bosons near compact objects can form gravitationally bound states, some of which grow exponentially by extracting black hole rotational energy or through relaxation from ambient waves. These states can reach field amplitudes approaching the Planck scale, leading to non-perturbative phenomena analogous to early-universe cosmology and to observational signatures far stronger than...
In this talk, I will discuss about my recent work on the searches for the ultralight scalar dark matter with quadratic interactions with SM fields. This will lead to the effective interactions between the ultralight dark matter and the nucleon fields phi^2 N N/f below the QCD confinement scale, which can be thought as potential barrier for the dark matter wind in the presence of ordinary...
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,...
Dark photon is one of the potential dark matter candidates with compelling cosmological origins and favorable extensions of fundamental physics beyond the Standard Model. Haloscope experiments are underway to detect the bosonic candidate by exploiting its weak couplings to the resonating electromagnetic fields in microwave cavities. Quantum metrology enables sensitive haloscope dark matter...
Constraints on axions from neutrino experiments
Magnetic white dwarfs may reveal axions through a simple astrophysical scenario: photons leaving the stellar surface can convert into axions while traversing the star's intense magnetic field. As the star rotates, the changing magnetic geometry can imprint a periodic, energy-dependent modulation on the observed light. Precision photometry can therefore turn rotating magnetic stars into...
The orbital evolution of the Hulse-Taylor binary neutron star system is described with high precision by General Relativity, in which gravity is the only long-range force and gravitational waves provide the dominant energy-loss channel. We use this precision test of relativistic binary dynamics to derive new constraints on axion couplings to stable neutron-star constituents: neutrons,...
Spontaneous CP violation (SCPV) provides an attractive solution to the strong CP problem. However, SCPV after inflation suffers from the formation of CP domain walls, requiring the maximal temperature of the Universe to lie below the CP-breaking scale. In the present work, we then propose a dynamical mechanism that removes this cosmological constraint without introducing permanent explicit...
We explore the interplay of the post-inflationary QCD axion and a light scalar field for the axion domain wall decay and dark matter (DM). The scalar field possesses a nonzero vacuum expectation value (VEV) during inflation, so that its interaction with the axion effectively serves as an explicit Peccei-Quinn (PQ) violating term. At a temperature below the PQ phase transition, the effective PQ...
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...
Axions and axion-like particles are compelling dark-matter candidates whose derivative couplings to fermion spins generate an oscillatory, spin-dependent effective field, often referred to as the axion wind. This talk explores semiconductor quantum-dot spin qubits as frequency-resolved quantum sensors for axion-induced spin dynamics and, more broadly, as a platform for weak-field detection at...
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 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...
If the Universe is described by string theory or other extensions of the Standard Model, several light, axion-like states are predicted to exist. However, most experiments only search for one of these states. We show that searches for fifth forces can't assume a non-relativistic potential induced by a single axion field. We discuss the strength of the non-relativistic spin-dependent and...
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...
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...
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,...
The presentation concerns a physics-informed neural-network framework for solving coupled axion–Maxwell equations in inhomogeneous electromagnetic backgrounds. In particular, it considers numerical modelling of axion–photon conversion in resonant and non-uniform field configurations, with potential applications to haloscopes, helioscopes, and quantum-sensor-based axion detection.
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...
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...
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 introduce the basics and recent developments of cosmological collider physics and cosmological correlators, with an emphasis on their applications to axions.
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...
