Conveners
Afternoon 2: Session 2
- Gray Rybka (University of Washington)
Afternoon 2: Poster 2
- Theopisti Dafni (CAPA/Universidad de Zaragoza)
The XENONnT experiment, operating since 2020, is at the forefront of the quest for the dark matter candidate Weakly Interacting Massive Particles (WIMPs), leveraging a 5.9-tonne liquid xenon target. Its world-leading lowest electronic recoil background has also rendered it a versatile instrument for investigating a broad spectrum of phenomena beyond the Standard Model. This talk will focus on...
The Standard Halo Model predicts that dark matter detection on Earth should exhibit annual modulation. The DAMA/LIBRA experiment, utilizing NaI(Tl) crystal detectors, reported detecting an annual modulation signal that aligns with dark matter characteristics, achieving a significance of over 13 sigma. However, this result has not been replicated by any other experiment. To directly test...
The Any Light Particle Search II (ALPS II) is a light-shining-through-a-wall (LSW) style experiment currently running at DESY in Hamburg, Germany, that is probing the universe for axions and axion-like particles at masses below 0.1 meV. LSW experiments use an entirely laboratory based approach, in which a beam of axions is generated, via the Sikivie effect, as a high power laser traverses a...
Ultraprecise mechanical sensors offer an exciting avenue for testing new physics. While many of these sensors are tailored to detect inertial forces, magnetically levitated (Maglev) systems are particularly interesting, in that they are also sensitive to electromagnetic forces. In this talk, I will propose the use of Maglev systems to detect dark-photon and axion dark matter. Several existing...
In the presentation, we will detail our five-year work at the Center for Axion and Precision Physics Research (CAPP) in developing and optimizing quantum-noise-limited amplifiers based on flux-driven Josephson Parametric Amplifiers (JPAs) for axion detection experiments. Our research focuses on achieving the lowest noise performance to enhance the scanning speed for detecting potential axion...
Galaxies and their dark-matter haloes are commonly presupposed to spin. But it is an open question how this spin manifests in haloes and soliton cores made of scalar dark matter (SDM, including fuzzy/wave/ultralight-axion dark matter). One way spin could manifest in a necessarily irrotational SDM velocity field is with a vortex. But recent results have cast doubt on this scenario, finding that...
We derive and review cosmological constraints on axion-like particles (ALPs), produced thermally via freeze-in through their interaction with gluons, photons and Standard Model (SM) fermions and non-thermally through the misalignment mechanism and decay of topological defects. In particular, we discuss the QCD, the photophilic and the photophobic ALP scenarios where the ALPs couple...
Scheelite, or calcium tungstate (CaWO4), is a scintillating dielectric material of significant interest for its potential application in a myriad of contexts. It plays a key role in detection of rare events such as neutrinoless double β-decay, radioactive decay of very long-living isotopes and searches for weakly interacting massive particles (WIMPs), a candidate for dark matter (DM). In...
In this talk, we evaluate the energy loss rate of supernovae induced by the axion emission process π− + p → n + a with the ∆(1232) resonance in the heavy baryon chiral perturbation theory for the first time. Given the axion-nucleon-∆ interactions, we include the previously ignored ∆-mediated graphs to the π− + p → n + a process. In particular, the ∆0-mediated diagram can give a resonance...
Ultralight dark photons are compelling dark matter candidates, but their allowed kinetic mixing with the Standard Model photon is severely constrained by requiring that the dark photons do not collapse into a cosmic string network in the early Universe. In particular, the most minimal dark photon production mechanism is constrained to small kinetic mixings out of range of all proposed direct...
Quantum Sensors for the Hidden Sector (QSHS) is a new UK-based collaboration working on resonant cavity detectors for halo axions. Our search facility, an 8.5mK dilution refrigerator containing a 20cm bore, 20cm long experimental volume threaded by an 8T magnetic field, was funded by STFC in 2021, and is now running at the University of Sheffield. The collaboration is developing a variety of...
The Cosmic Background (CB) is defined as the isotropic diffuse radiation field with extragalactic origin found across the electromagnetic spectrum. Assuming that dark matter consists of axions with masses on the order of electron volts or higher, we expect a contribution to the CB due to their decay into two photons. Using a model of the astrophysical origin of the CB between X-ray energies...
We propose a scenario where baryon asymmetry is generated spontaneously by the majoron which is also a dark matter candidate. For this, we investigate two distinct scenarios depending on the source of the majoron kinetic motion providing CPV in the background : 1) the misalignment mechanism, and 2) the kinetic misalignment mechanism. The former case can be realized in a very limited parameter...
The MADMAX experiment aims to search for dark matter axions in the frequency range 10-100 GHz using a configuration where large thin dielectric disks are stacked in parallel under a strong magnetic field.
When searching for a narrow signal using a large bandwidth, data acquisition plays a critical role. Here we describe a data acquisition system based on a spectrum analyzer. In addition...
Motivated by recent findings from Belle II, where $\mathcal{B}(B^+ \to K^+ \nu\bar{\nu}) = (2.3 \pm 0.5) \times 10^{-5}$, surpassing the Standard Model prediction by $2.7 \sigma$, we explore axion-based hypotheses to elucidate this discrepancy.
We examine a model based on the KSVZ-type axion, which not only accounts for the Belle II anomaly but also offers resolutions to the strong CP problem...
The axion was postulated as a solution to both the strong CP problem and the dark matter mystery. Among the various experiments designed to detect axion dark matter signal, the cavity haloscope is recognized as the most sensitive method. However, its sensitivity decreases significantly at higher mass regions due to volume loss. To address this issue, the Center for Axion and Precision Physics...
Axions, which provide a solution to the strong CP problem, are one of the most prominent candidates for dark matter. The axion parameter space spans many orders of magnitude in mass, and a variety of search techniques will be needed to cover such a wide range. Haloscopes look for axion-photon conversion in a magnetic field, but they face the challenge of being smaller in volume as the axion...
The signal from an axion haloscope has a certain spectral content, set by the axion rest mass, mc2, and the relative kinetic energy K of the axions at the detector. For virialized halo axions, the ratio of these energies is K/mc2 ~ 10-6. If the detector is operating at 1 GHz, the signal emitted would have a spectral width of 1 kHz. On account of the high Q ~ 105 of the cavity, the detector...
Axion Quark Nuggets (AQNs) [1] have been suggested to solve the Dark Matter (DM) and the missing Antimatter problem in the universe, and have been proposed as an explanation of various observations [2-4]. Their size is in the μm range, and their density is equal to the nuclear density with an expected flux of about 1/km^2/year. For the typical velocity of DM constituents (250 km/s), the solar...
