Imposing Stronger Constraints at the Submicron Range on Hypothetical Long-Range Forces

在亚微米范围内对假设的远程力施加更强的约束

• 批准号: 1607360
• 负责人: Ricardo Decca
• 金额: $ 29.97万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1607360&HistoricalAwards=false
• 关键词: Imposing; Stronger; Constraints; Submicron; Range

Search for macroscopic forces outside predictions from the Standard Model of cosmology have received particular attention by experimentalists in the last few decades. Understanding the fundamental forces of nature has always been an important part of physics. While the first such force studied was the gravitational force and our understanding of this interaction is extremely precise for relatively large separations among the interacting bodies, its validity at short distances has only recently been tested. Furthermore, the possibility of undetected light bosons, elementary particles governing the interaction between spin polarized bodies, is very poorly constrained. The groups plans to undertake an effort to gain a better understanding of these issues. By combining sample development and very precise measurements of the interactions between a source and a test mass, a much better knowledge of the interaction strength and mass of potential light bosons will be gained. The PI and co-PI will continue to attract undergraduate and high school students in physics and engineering to participate in the proposed work. Graduate students involved in the project will also have supervisory duties over undergraduate students, improving their leadership skills. Both PIs are minority members, and they will recruit students to participate in this research from underrepresented groups in physics. In particular the PI will use his position as co-advisor of the Society for the Advancement of Chicanos and Native Americans in Science (SACNAS)-IUPUI chapter to interest the Hispanic and Native American community in Science careers. Graduate students will be trained in two sub-disciplines in physics, precision measurements and magnetism. Demonstrations associated with the principles of forces, their actions at a distance and the decrease of their strength as the distance increases will be presented at community gathering events (School of Science Freshmen Picnic Day, Open Houses) and recruiting events and in the classroom environment.Specifically, this proposal will: i) extend existing constraints for unpolarized masses at submicron range. This will be achieved mainly through a minor modification of the system previously used, ii) develop spin-polarized masses with no net magnetization. This development will be accomplished by the deposition of thin films in the required geometry, (iii) use the grown spin-polarized, zero magnetization films to constrain the existence of monopole-dipole interactions at short ranges, and (iv) study the systematic effect of the residual electrostatic forces present in the experiment. The ubiquitous problem encountered in the measurement of small forces at short separations arising from the effect of random electric potential on the surfaces of the test and source bodies will continue to be investigated.

在过去的几十年里，对宇宙学标准模型预测之外的宏观力的研究受到了实验学家的特别关注。理解自然界的基本力一直是物理学的重要组成部分。虽然第一个这样的力研究是引力和我们的理解这种相互作用是非常精确的相对较大的分离之间的相互作用的机构，其有效性在短距离最近才得到测试。此外，未被检测到的光玻色子（控制自旋极化物体之间相互作用的基本粒子）的可能性非常有限。这些小组计划作出努力，以便更好地了解这些问题。通过结合样品开发和对源和测试质量之间的相互作用的非常精确的测量，将获得对潜在轻玻色子的相互作用强度和质量的更好的了解。PI和co-PI将继续吸引物理和工程专业的本科生和高中生参与拟议的工作。参与该项目的研究生也将对本科生负有监督责任，提高他们的领导能力。两个PI都是少数民族成员，他们将从物理学中代表性不足的群体中招募学生参与这项研究。特别是PI将利用他作为科学促进奇卡诺斯和美洲原住民协会（SACNAS）-IUPUI分会的共同顾问的职位，使西班牙裔和美洲原住民社区对科学事业感兴趣。研究生将接受物理学、精密测量和磁学两个子学科的培训。与力的原理相关的演示，它们在远处的作用以及它们的强度随着距离的增加而减小，将在社区聚会活动（科学学院新生野餐日，开放日）和招聘活动以及教室环境中呈现。具体来说，该提案将：i）在亚微米范围内扩展现有的非极化质量限制。这将主要通过对先前使用的系统进行微小修改来实现，ii）开发没有净磁化的自旋极化质量。这一发展将完成所需的几何形状的薄膜的沉积，（iii）使用生长的自旋极化，零磁化膜，以限制在短范围内的偶极子-偶极子相互作用的存在，及（iv）研究在实验中存在的残余静电力的系统效果。在测量短距离处的小力时遇到的普遍存在的问题将继续研究，该问题是由测试体和源体表面上的随机电势的影响引起的。