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arXiv 1401.2643gr-qchep-phhep-th
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关于外尔不变量引力理论的物理结果

On the physical consequences of a Weyl invariant theory of gravity

Israel Quiros

摘要:

在本文中,我们探讨的物理后果,假设外尔不变性的引力定律从经典的立场。实际的外尔不变性要求用外尔可积几何(Weyl integrable geometry,WIG)来代替背景时空的基本黎曼几何结构。我们表明,规范的自由,Weyl不变的引力理论的一个显着特点,导致非常不寻常的后果。例如,在基于WIG的共形不变引力理论(也称为共形广义相对论)的宇宙学背景下,静态宇宙在物理上等价于经历德西特膨胀的宇宙。球对称黑洞在物理上也与无奇性虫洞等价。在CGR框架中规范自由的另一个突出结果是,在标准GR宇宙学中出现的其他难题中,不需要暴胀来解释平坦性,视界和残余粒子丰度。此外,在这个系统中也不会出现宇宙学常数和质量等级问题。

英文摘要:

In this paper we explore the physical consequences of assuming Weyl invariance of the laws of gravity from the classical standpoint exclusively. Actual Weyl invariance requires to replace the underlying Riemannian geometrical structure of the background spacetimes by Weyl integrable geometry (WIG). We show that gauge freedom, a distinctive feature of Weyl invariant theories of gravity, leads to very unusual consequences. For instance, within the cosmological setting in a WIG-based conformal invariant gravity theory, also known as conformal general relativity (CGR), a static universe is physically equivalent to a universe undergoing de Sitter expansion. It happens also that spherically symmetric black holes are physically equivalent to singularity-free wormholes. Another outstanding consequence of gauge freedom in the framework of CGR is that inflation is not required to explain the flatness, horizon and relict particle abundances, among other puzzles that arise in standard GR-based cosmology. Besides, the cosmological constant and the mass hierarchy problems do not arise neither in this setup.

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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