Improved tests of Lorentz and CPT symmetry using noble gas and hydrogen masers

使用惰性气体和氢脉泽改进洛伦兹和 CPT 对称性测试

• 批准号: 0502279
• 负责人: Ronald Walsworth
• 金额: --
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0502279&HistoricalAwards=false
• 关键词: Improved; tests; Lorentz; CPT; symmetry

This experimental research program is aimed at performing improved tests of Lorentz and CPT symmetry of the neutron and the proton using a noble gas (129Xe/3He) Zeeman maser and a hydrogen maser, respectively. In the proposed three-year program the PI will optimize the performance of the upgraded 129Xe/3He and hydrogen masers; perform long-term monitoring (more than one year) of maser (i.e., spin precession) frequencies; characterize possible systematic effects; and analyze and present the results of these measurements. The expected result of this study is unprecedented sensitivity to possible effects of quantum gravity such as an anisotropy or non-commutativity of space-time, and to the coupling of neutrons and protons to a time-varying cosmological scalar field, which is a leading candidate for dark energy. The broader impact of the program involves student education as well as applications, including MRI at low magnetic fields of hyperpolarized noble gas inhaled into human lungs for studies of basic pulmonary physiology and diseases such as asthma and emphysema.

该实验研究计划旨在分别使用惰性气体 (129Xe/3He) 塞曼脉泽和氢脉泽对中子和质子的洛伦兹和 CPT 对称性进行改进的测试。 在拟议的三年计划中，PI 将优化升级后的 129Xe/3He 和氢微波激射器的性能；对微波激射器（即自旋进动）频率进行长期监测（一年以上）；描述可能的系统效应；并分析并呈现这些测量的结果。 这项研究的预期结果是对量子引力可能产生的影响（例如时空的各向异性或非交换性）以及中子和质子与时变宇宙标量场（暗能量的主要候选者）的耦合具有前所未有的敏感性。该计划更广泛的影响涉及学生教育和应用，包括吸入人肺的超极化惰性气体低磁场下的 MRI，用于研究基本肺部生理学和哮喘和肺气肿等疾病。