权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Development of Optical Transducer for Gravitational wave detector based on Resonating massive vibrator

基于共振大质量振子的引力波探测器光换能器的研制

基本信息

批准号：
12640298
负责人：
TANAKA Masayoshi
金额：
$ 0.77万
依托单位：
Kobe Tokiwa Jr. College
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640298/
关键词：
graviational wave Einstein vibrational massive resonator type neutron star binary general relativity equivalence principle gravitational moment Lense-Thirring effect アインシュタインの方程式共振型重力波アンテナプラックホール AURIGA mini GRAIL 光学トランスジューサ

项目摘要

When Einstein constructed the theory of general relativity, he predicted the existence of gravitational wave (GW). Indirect observation of GW was already done in the latter of the last century, while its direct observation has been still unsuccessful. In other words, the direct observation of the GW is one of fundamental subject of physics in this century.We started developing a transducer for detection of the GW signals to be attached on a vibrational massive resonator type antenna working at a low temperature. As possible transducers to detect vibrations due to the GW, we examined optical interferrometer, SQUID, Piezo element, and capacitive pickup. For enabling computer control and data taking, we have introduced a Lab-view system.Meanwhile, we started investigating fundamental physics associated with the GW. In collaboration with the group of the GW antenna from Padova, Italy, we discussed possible existence of the gravitomagnetic moments of elementary particles. As a result, we predict that each elementary particle may have a gravitational moment such as a gravitational electric dipole moment and/or gravitational magnetic dipole moment by the multipple expansion of the gravitational field in a similar way to the procedure of the electromagnetic theory.The former moment will be present when the equivalence principle is broken, while the latter moment was the term which was first predicted by Linse-Thirring just after the advent of the general relativity in 1916. The origin of this term is associated with thei effect induced by the rotating gravitational mass and sometimes called the Frame dragging. This term is expected for example, in the rotating earth or neutron star binary.Efforts to find this term has initiated in the world scale by using sattelites or astronomical observation. However, no one has ever predicted existence of such moments, in particular, the gravitomagnetic dipole moment inherent in the elementary particles.

爱因斯坦在建立广义相对论时，就预言了引力波的存在。在上个世纪后期，人们已经对GW进行了间接观测，而直接观测至今尚未成功。换句话说，直接观测GW是本世纪物理学的基本课题之一。我们开始开发用于检测GW信号的传感器，该传感器将安装在低温下工作的振动质量谐振器型天线上。作为可能的传感器，以检测由于GW的振动，我们研究了光学干涉仪，SQUID，压电元件，和电容拾取。为了实现计算机控制和数据采集，我们引入了Lab-view系统。同时，我们开始研究与GW相关的基础物理。在与来自意大利帕多瓦的GW天线小组的合作中，我们讨论了基本粒子的重力磁矩的可能存在。因此，我们用类似于电磁理论的方法，通过引力场的多重展开，预言每个基本粒子都可能有引力矩，如引力电偶极矩和/或引力磁偶极矩，当等效原理被打破时，而后者是在1916年广义相对论出现后，Linse-Thirring首次预言的术语。这一项的起源与旋转的引力质量引起的效应有关，有时称为坐标系拖曳。例如，在旋转的地球或中子星星双星中，这一项是预期的。通过使用卫星或天文观测，在世界范围内寻找这一项的努力已经开始。然而，从来没有人预测过这种力矩的存在，特别是基本粒子固有的重力磁偶极矩。