Impedance Matching to Axion Dark Matter: Considerations of the Photon-Electron Interaction
Saptarshi Chaudhuri
备注：
18 pages, 3 figures, plus references and appendices. v2: Section added on the practical implications of the work. v3: Text matches JCAP publication version. Minor editorial adjustments
We introduce the concept of impedance matching to axion dark matter by posing the question of why axion detection is difficult, even though there is enough power in each square meter of incident dark-matter flux to energize a LED light bulb. By quantifying backreaction on the axion field, we show that a small axion-photon coupling does not by itself prevent an order-unity fraction of the dark matter from being absorbed through optimal impedance match. We further show, in contrast, that the electromagnetic charges and the self-impedance of their coupling to photons provide the principal constraint on power absorption integrated across a search band. Using the equations of axion electrodynamics, we demonstrate stringent limitations on absorbed power in linear, time-invariant, passive receivers. Our results yield fundamental constraints, arising from the photon-electron interaction, on improving integrated power absorption beyond the cavity haloscope technique. The analysis also has significant practical implications, showing apparent tension with the sensitivity projections for a number of planned axion searches. We additionally provide a basis for more accurate signal power calculations and calibration models, especially for receivers using multi-wavelength open configurations such as dish antennas and dielectric haloscopes.
Search for QCD axion dark matter with transmon qubits and quantum circuit
Kyoto University（京都大学）；The University of Tokyo（东京大学）；International Center for Elementary Particle Physics (ICEPP), The University of Tokyo（东京大学 elementary particle physics 国际中心）；KEK（高能加速器研究机构）
Search for Ultralight Axion Dark Matter with a Levitated Ferromagnetic Torsional Oscillator
School of Physics, Hefei University of Technology（合肥工业大学物理学院）；National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University（南京大学固体微结构物理国家重点实验室和物理系）
Technically Natural Baryogenesis with the QCD Axion
University of California Santa Cruz（加州大学圣克鲁兹分校）；University of Washington（华盛顿大学）；International Centre for Theoretical Physics（国际理论物理中心）；Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Trieste（意大利国家核物理研究所的里雅斯特分部）；University of California, Berkeley（加州大学伯克利分校）；Lawrence Berkeley National Laboratory（劳伦斯伯克利国家实验室）
Generation of Axion-Like Couplings via Quantum Corrections in a Lorentz Violating Background
轻赝标量，或称类轴子粒子（axion like particles，ALPs），由于其与粒子物理、天体物理和宇宙学领域的潜在相关性而被广泛研究。从目前的实验研究的角度来看，最相关的耦合的ALP是光子：在这项工作中，我们研究了这种耦合的产生作为量子校正的影响，起源于一个潜在的洛伦兹违反背景。最有趣的是，我们表明，这样产生的相互作用原来是洛伦兹不变的，从而模仿标准的ALP耦合到光子，在实验中考虑。这种考虑意味着，时空对称性的破坏，作为非常高能量尺度下物理学的可能结果而被研究得很多，可能会以意想不到的方式渗透到物理学的其他领域。此外，我们推测，类似的机制也可以产生洛伦兹不变耦合涉及标量粒子和光子，发挥了可能的作用，在希格斯玻色子的现象。
New constraints on axion with gamma-ray observations of the Crab Nebula
National Astronomical Observatory of Japan (NAOJ)（日本国立天文台）；Graduate University for Advanced Studies (SOKENDAI)（高级研究院）；High Energy Accelerator Research Organization (KEK)（高能加速器研究机构）；The University of Tokyo（东京大学）
Probing the CP Property of ALP-photon Interactions at Future Lepton Colliders
Center for High Energy Physics, Peking University（北京大学高能物理中心）；School of Physics and Astronomy, Beijing Normal University（北京师范大学物理与天文学院）；Key Laboratory of Multiscale Spin Physics (Ministry of Education), Beijing Normal University（北京师范大学多尺度自旋物理教育部重点实验室）；State Key Laboratory of Nuclear Physics and Technology, Institute of Quantum Matter, South China Normal University（华南师范大学量子物质研究院核物理与技术国家重点实验室）；Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Guangdong Provincial Key Laboratory of Nuclear Science（广东省基础学科研究中心（物质结构与基本相互作用）、广东省核科学重点实验室）
