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arXiv 1101.2174hep-thastro-ph.COgr-qc
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非对易谱几何中的宇宙学

Cosmology within Noncommutative Spectral Geometry

Mairi Sakellariadou

摘要:

接近普朗克能量尺度时,时空的量子性质揭示了它自己,所有的力,包括引力,应该是统一的,这样所有的相互作用都对应于一个潜在的对称性。在没有完整的量子引力理论的情况下,人们可以遵循一种有效的方法,将时空看作是四维连续紧致黎曼流形与一个微小的离散有限非对易空间的乘积。由于所有可用的数据都是光谱性质的,人们可能会认为在这个几乎可交换的空间中应用光谱作用量原理更合适。按照这一步骤,人们可以对最成功的粒子物理模型,即由实验数据确定的电弱相互作用和强相互作用的标准模型(和超对称扩展)的所有细节,得到一个优雅的几何解释。此外,由于这种引力理论是在非常高的能量尺度上建立起来的,它为解决一些仍在等待答案的早期宇宙学问题提供了一个完美的框架。在介绍了非对易谱几何的一些主要数学元素之后,我将讨论这个理论的各种宇宙学和唯象学后果,特别关注对理论引力部分的约束。

英文摘要:

Close to the Planck energy scale, the quantum nature of space-time reveals itself and all forces, including gravity, should be unified so that all interactions correspond to just one underlying symmetry. In the absence of a full quantum gravity theory, one may follow an effective approach and consider space-time as the product of a four-dimensional continuum compact Riemanian manifold by a tiny discrete finite noncommutative space. Since all available data are of a spectral nature, one may argue that it is more appropriate to apply the spectral action principle in this almost commutative space. Following this procedure one obtains an elegant geometric explanation for the most successful particle physics model, namely the standard model (and supersymmetric extensions) of electroweak and strong interactions in all its details, as determined by experimental data. Moreover, since this gravitational theory lives by construction at very high energy scales, it offers a perfect framework to address some of the early universe cosmological questions still awaiting for an answer. After introducing some of the main mathematical elements of noncommutative spectral geometry, I will discuss various cosmological and phenomenological consequences of this theory, focusing in particular on constraints imposed on the gravitational sector of the theory.

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。

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