三维光学阱中的轴子产生
Axion Generation in a Three-Dimensional Optical Trap
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中文总结 AI 辅助
研究旨在利用光学纺锤阱产生轴子，该阱由桌面激光构建，光子数在阱内有独特变化，经监测和成像排除探测器假象，基于能量守恒推测光子转换为轴子，为研究强CP问题和类轴子暗物质提供了可行的自由空间轴子源。
中文摘要 AI 辅助
轴子是一种理论粒子，可解决多个基本问题，如量子色动力学中的强电荷共轭宇称对称（CP）问题及暗物质本质，但尚未在自由空间实验中被探测到。本文设计并构建了基于激光的系统，产生具有零中心区域的三维封闭捕获势场，即光学纺锤阱（OST）。沿传播轴，光子数从阱的左端到右端有独特变化，先减少后恢复，类似于光穿墙实验中寻找的光子-轴子-光子转换过程。用单光子计数器（SPC）监测光子数，极低光功率下的电荷耦合器件（CCD）成像也证实了该行为，排除探测器假象。基于能量守恒，缺失光子归因于转换为轴子且未被SPC和CCD探测到，转换机制归因于自旋耦合的轴子-光子相互作用。这种毫米级的光学纺锤阱为由桌面激光产生的可行自由空间轴子源，用于研究强CP问题和类轴子暗物质候选者。
英文摘要
The axion is a theoretical particle that could resolve multiple fundamental problems, most notably the strong Charge-conjugation-parity-symmetry (CP) problem in quantum chromodynamics and the nature of dark matter.To date, however, the axion has never been detected in any free-space experiment. In this work, we designed and constructed a laser-based system that generates a three-dimensional, closed trapping potential field with a null central region. Owing to its spindle-like geometry, we term this configuration an optical spindle trap (OST). Along the propagation axis, the photon population evolves in a distinct manner from the left to the right terminus of the trap: it first diminishes and then recovers to its baseline value.This behavior is analogous to the photon axion photon conversion process sought in light shining through wall experiments(LSW)1-3, in which a measured photon deficit would constitute evidence for axion conversion. The photon population was monitored with a single-photon counter (SPC) operated well below its saturation threshold, and the observed behavior was corroborated by charge-coupled device (CCD) imaging at extremely low optical powers, thereby excluding detector artefacts as the origin of the photon deficit.Under the constraint of energy conservation, the missing photons are attributed to conversion into axions that remain undetectable by both the SPC and the CCD. The underlying conversion mechanism is ascribed to spin-coupled axion photon interactions. This tens-of-millimeter-scale optical spindle trap thus provides a viable free-space axion source, generated by a table-top laser, for the study of the strong CP problem and axion-like dark matter candidates.
