Quantum gravity from noncommutative spacetime

Quantum gravity from noncommutative spacetime
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来自非交换时空的量子引力

DOI:
10.3938/jkps.65.1754
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发表时间:
2010
影响因子:
0.6
通讯作者:
Hyun Seok Yang
Hyun Seok Yang
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Jungjai Lee;Hyun Seok Yang

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我们回顾了一种新颖而可信的引力量子化方法。这种新的方法是基于这样一个事实,即爱因斯坦引力可以用辛几何而不是黎曼几何来表示,在浮现引力的背景下。从辛流形或泊松流形上的U(1)规范理论出发,实现引力理论(广义相对论)中最重要的性质--等价原理,是浮现引力的一个重要步骤。通过实现等价原理,我们可以理解微分同胚对称性是如何从非对易U(1)规范理论中产生的,从而引力可以从非对易电磁中产生,而非对易电磁也是一种相互作用理论。因此,可以建立一个与背景无关的量子引力,其中任何时空结构的先验存在都不是先验假设的,而是通过使用量子引力理论中的基本成分来定义的。量子引力的这个方案可以用来解决理论物理中许多臭名昭著的问题,比如宇宙常数问题,理解暗能量的本质,并解释为什么引力与其他力相比如此弱。特别是,它导致了物质是什么的一幅非凡的图景。像轻子和夸克这样的物质场只是作为一个稳定的定域几何出现的,它是量子引力定义代数(非对易★-代数)中的一个拓扑对象。
We review a novel and authentic way to quantize gravity. This novel approach is based on the fact that Einstein gravity can be formulated in terms of a symplectic geometry rather than a Riemannian geometry in the context of emergent gravity. An essential step for emergent gravity is to realize the equivalence principle, the most important property in the theory of gravity (general relativity), from U(1) gauge theory on a symplectic or Poisson manifold. Through the realization of the equivalence principle, which is an intrinsic property in symplectic geometry known as the Darboux theorem or the Moser lemma, one can understand how diffeomorphism symmetry arises from noncommutative U(1) gauge theory; thus, gravity can emerge from the noncommutative electromagnetism, which is also an interacting theory. As a consequence, a background-independent quantum gravity in which the prior existence of any spacetime structure is not a priori assumed but is defined by using the fundamental ingredients in quantum gravity theory can be formulated. This scheme for quantum gravity can be used to resolve many notorious problems in theoretical physics, such as the cosmological constant problem, to understand the nature of dark energy, and to explain why gravity is so weak compared to other forces. In particular, it leads to a remarkable picture of what matter is. A matter field, such as leptons and quarks, simply arises as a stable localized geometry, which is a topological object in the defining algebra (noncommutative ★-algebra) of quantum gravity.
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DOI: --
发表时间: 2009
期刊: JHEP
影响因子: --
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DOI: --
发表时间: 2009
期刊: JHEP
影响因子: --
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