arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0709.0494hep-th
收藏

引力的量子理论与时间悖论的解决

Toward a Quantum theory of Gravity and a Resolution of the Time paradox

Edward Tetteh-Lartey

摘要:

理论物理学面临的主要问题之一是寻找引力的量子理论和解决宇宙学常数问题。人们相信,一个真正的引力量子理论将导致解决这个问题。寻找引力的量子理论一直是一个困难的问题,主要是因为测试量子引力所需的高能量尺度,这是目前加速器所无法达到的。此外,广义相对论不具有自然时间变量,因此时间的性质在量子引力中并不清楚,这就是所谓的时间悖论。两个主要的方法是弦理论和圈量子引力。弦论统一了所有的相互作用,但提供了一个微扰的背景依赖的公式,违反了一般的协变性。圈量子引力提供了一个非微扰的方法,但没有提供一个统一的相互作用理论,大多数物理学家认为这应该是普朗克尺度能量的情况。它似乎也与低能量现象无关。在这篇文章中,我将研究量子宇宙学如何通过合并微扰和非微扰方法的输入,并解决时间悖论问题,为量子引力理论提供有用的推论。

英文摘要:

One of the major issues confronting theoretical physics is finding a quantum theory of gravity and a resolution to the cosmological constant problem. It is believed that a true quantum theory of gravity will lead to a solution to the this problem. Finding a quantum theory of gravity has been a difficult issue mainly because of the high energy scale required for testing quantum gravity which is far the reach of current accelerators. Also general relativity does not possess a natural time variable thus the nature of time is not clear in quantum gravity, a problem called the time paradox. The two main approaches are string theory and loop quantum gravity. String theory unifies all interaction but provides a perturbative background dependent formulation which violates general covariance. Loop quantum gravity provides a non-perturbative approach but does not provide a unified theory of interactions, which most physicist believe should be the case at Planck scale energies. It doesn't also seem to connect with low energy phenomena. In this note I look at how quantum cosmology provides useful inference toward a quantum gravity theory by merging inputs from the perturbative and the non-perturbative approaches, and resolving the time paradox issue.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑