Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. In the standard scenario where the freeze-out happens well after the end of inflationary reheating, they are in tension with severe experimental constraints. Here, we investigate the thermal freeze-out of WIMPs occurring during reheating, while the inflaton $\phi$ coherently oscillates in a...
This article presents the development of a broadband haloscope read-out based on a flux-driven Josephson Parametric Amplifier (JPA). While the JPA offers extremely low noise close to the quantum noise limit, initial devices had a tunable frequency range of 30 MHz, which required frequent warm-up and replacement. This results in a significant loss of time and the use of large amounts of liquid...
Understanding of the production of axions from global string decays in the early universe is indispensable for the precise estimation of the relic axion abundance and for a sharp prediction of the axion dark matter mass. In this contribution, we present the state-of-the-art results on the analysis of the spectrum of dark matter axions radiated by strings based on the large scale numerical...
We study the imprints of a cosmological redshift-dependent pseudoscalar field on the rotation of cosmic microwave background.
We show how either phenomenological or theoretically motivated redshift dependence of the pseudoscalar field, such as those in models of Early Dark Energy, Quintessence or axion-like dark matter, lead to CMB polarization and temperature-polarization power spectra which...
Axion-like particles or generalized pseudoscalar singlets are ubiquitous in BSM. Studying the evolution of their interactions with the SM is therefore of utmost importance.
I will discuss this interplay based on the derivation of the full set of renormalization group equations of the complete singlet EFT at one-loop accuracy, including shift-breaking and CP-violating interactions, and...
The Any Light Particle Search II (ALPS II) experiment searches for axions and axion-like particles (ALPs) in an important parameter space that is relevant in understanding anomalous astrophysical phenomena, including stellar evolution. ALPS II takes advantage of the axion coupling to photons using a resonantly enhanced Light-Shining-through-a-Wall (LSW) technique. Photons created using a...
It is well known in cosmology that the history of the Universe undergoes a period of quasi exponential expansion. The fluctuations of the inflaton field are believed to have a quantum origin, however the CMB sky we observe today is classical. Therefore the questions whether the initial perturbations have a quantum or classical origin and how to discriminate them arise. Actually inflation...
Dark Matter searches utilizing single-photon and phonon excitations have been broadly accepted as effective methods of harnessing the miniscule energies transferred from Ultra-light and Light Dark Matter. Qubits are highly sensitive to sub-eV energy phonons and photons which make them a compelling detection technology for light and Ultralight Dark Matter. We will discuss the potential of this...
We present a first combined theory prediction for the distribution of axion-photon couplings for non-minimal DFSZ and KSVZ models. Couplings of DFSZ models with more than one additional Higgs doublet are comparable to the non-minimal KSVZ literature values. They extend over a large range of parameters, reaching values up to almost three orders of magnitude larger than the ones observed in...
The Peccei-Quinn solution to the strong CP problem has a problematic aspect: it relies on a global U(1) symmetry which, although broken at low energy by the QCD anomaly, must be an extremely good symmetry of high-energy physics. This issue is known as the Peccei-Quinn quality problem. We propose a model where the Peccei-Quinn symmetry arises accidentally and is respected up to high-dimensional...
The Global Network of Optical Magnetometers for Exotic physics searches (GNOME) [1] uses precise atomic spin-based sensors (magnetometers and comagnetometers) to search for ultralight dark matter (e.g., axions and axion-like particles). GNOME searches for the global exotic spin perturbations that could be simultaneously observed in distant laboratories. It was recently proposed to use GNOME to...
The electric dipole moment of the electron (eEDM) is a sensitive probe for new physics beyond the Standard Model that can also provide indirect evidence for the existence of dark matter. We propose an experiment to measure the eEDM using diatomic polar molecules (BaF) embedded in a cryogenic matrix of parahydrogen. By exploiting the large internal molecular field available in BaF molecules and...
The search for dark matter axions is an ongoing challenge for modern physics, and conventional searches typically involve the use of external magnetic fields to detect axions. However, these experiments are not sensitive to the axion-photon couplings $g_{aAB}$ and $g_{aBB}$ predicted in scenarios based upon modified Quantum-Electromagnetodynamics. We propose here a novel approach to search for...
We present a new theory to predict dark matter (DM) particle mass, size, lifetime, and properties of possible dark radiation from DM particle decay. In self-gravitating collisionless dark matter, the existence of inverse mass and energy cascade from small to large scales facilitates the hierarchical structure formation. A scale-independent constant rate of energy cascade...
The \textbf{Ma}gnetized \textbf{D}isk and \textbf{M}irror \textbf{A}xion e\textbf{X}periment is a dielectric haloscope that aims to search for axionic dark matter. It utilizes a stack of movable dielectric disks, called a booster, to enhance the weak axion signal. The unique design enables a highly tunable resonator at frequencies inaccessible to traditional cavity haloscopes. However, the...
In the WISP search, the broad coverage of the mass region is crucial because we know neither dark matter mass nor coupling to standard model particles. In particular, many Axion or dark photon experiments search the conversion photon signal in radio wave range (O(1 GHz) - O(100 GHz)), and the signal is expected to be observed as a narrow peak. Therefore, ideal specifications of the...
We present constraints on Axion-Like Particles using very-high-energy gamma-ray data from the MAGIC telescopes in the direction of the Perseus Galaxy Cluster. Axion is envisioned and theorized as a solution to the Strong CP problem of the Standard Model. As a generalization of the axion, axion-like particles are introduced. Depending on the specifics of their production mechanisms in the Early...
The Main AXion Experiment (MAX) of the center for axion and precision physics research (CAPP) has achieved the DFSZ sensitivity in axion dark matter search by employing cutting-edge technology. The ultra-light cavity (ULC) of the experiment has a total weight of less than 5kg, even with a volume of 37 liters, and can achieve cavity temperatures below 30mK due to the use of a 0.5mm thick...
I will discuss minimal gauge extensions of the Standard Model where a new sector is predicted from the cancellation of gauge anomalies. As part of this new sector, there is a dark matter candidate and new sources of CP violation. I will discuss the dark matter phenomenology and the prediction of large electric dipole moments for the electron and the neutron.
Axion-like particles (ALPs) are a class of hypothetical bosons beyond the standard model of particle physis, which are very weakly-interacting and long-lived. Since many ALPs may be produced in hot plasma in supernovae (SNe), a nearby SNe Ia can be used as a probe of ALPs. It is desirable to predict the ALP emission from SNe Ia to discuss a possible constraint that can be obtained from the...
The upcoming helioscope experiment IAXO is sensitive to realistic QCD axion models, making it one of the most exciting future axion searches. Indeed, in case of a discovery, IAXO may even determine the axion mass in the multi-meV range and allow us to study solar metallicities, magnetic fields, and distinguish different solar or axion models.
This talk further explores that scenario. In...
