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Research on Quantum Fluctuation Phenomena and Gravitation

量子涨落现象与引力研究

基本信息

批准号：
9507351
负责人：
Lawrence Ford
金额：
$ 9.29万
依托单位：
Tufts University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-07-15 至 1998-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9507351&HistoricalAwards=false
关键词：
Research Quantum Fluctuation Phenomena Gravitation

项目摘要

This project will involve theoretical research on various aspects of quantum field theory and its relationship to gravitational theory and cosmology. The research will especially focus upon issues relating to quantum fluctuations, either in gravitational systems or in other contexts (such as boundary effects) which are analogous to gravity. One line of investigation will study the vacuum fluctuations of the electromagnetic field in flat spacetime. New physical effects which may be testable by experiment will be sought. A closely related line of investigation will study the effects of fluctuations of the gravitational field itself. When quantum matter fields act as the source of the gravitational field, there will often be large fluctuations in the energy density and pressure of the source which will translate into large fluctuations in the gravitational field. The effects of these fluctuations will be investigated. There are also fluctuations due to the quantum nature of the gravitational field itself. These will be studied in the context of a model where a background bath of gravitons causes the lightcone to be slightly smeared out. This smearing may produce effects upon other quantum fields which will lead to insights about the quantum nature of gravity and possibly even observable effects. In the latter case, one would also gain important information about the origin and evolution of the universe through the background of relic gravitons.

本项目将涉及量子场论的各个方面及其与引力理论和宇宙学的关系的理论研究。研究将特别关注与量子涨落有关的问题，无论是在引力系统中，还是在类似于引力的其他环境中（如边界效应）。一项研究将研究平坦时空中电磁场的真空涨落。将寻求可以用实验检验的新的物理效应。另一个密切相关的研究方向是研究引力场本身波动的影响。当量子物质场作为引力场源时，源的能量密度和压力往往会出现较大的波动，从而转化为引力场的较大波动。将研究这些波动的影响。由于引力场本身的量子性质，也存在波动。这些将在一个模型的背景下进行研究，在这个模型中，引力子的背景池会使光锥略微模糊。这种涂抹可能会对其他量子场产生影响，这将导致对引力的量子本质的见解，甚至可能是可观察到的效应。在后一种情况下，人们还可以通过残余引力子的背景获得关于宇宙起源和演化的重要信息。