论文标题

早期的深色能量来自高维理论

Early Dark Energy from a Higher-dimensional Gauge Theory

论文作者

Kojima, Kentaro, Okubo, Yuri

论文摘要

从CMB测量值估计的哈勃常数表明与局部测量值分歧很大。这种不一致被称为哈勃张力,近年来对其进行了广泛的研究。早期的暗能量(EDE)只有在重组之前的时期才对宇宙的总能量密度贡献了几个百分比,并且被认为是张力的有希望的解决方案。 EDE的简单实现是由标量场(称为EDE标量)的动力学给出的,并且在文献中对包括EDE标量在内的模型进行了广泛的研究。在本文中,我们介绍了一种基于高维尺度理论的新型EDE场景。与紧凑型额外尺寸相关的量规场的额外组成部分表现为EDE标量在低能量下,具有周期性的电势,其形式与伪nambu-goldstone玻色子(PNGB)相似。在五维的u(1)轨距理论中,我们表明,源自量规场的标量场可以通过其在PNGB类型电位中的动力学来提供EDE,并在理论中选择适当的参数。我们关注的是通过标量场来解释EDE的情况,并阐明对仪表理论的基本参数的约束,例如量规耦合,压实量表和物质字段的质量参数。我们还发现,EDE足够的稀释需要在物质领域的U(1)指控之间进行非平凡的关系。使用特定的物质内容,我们从数值上求解标量场的时间演变,并确认其能量密度作为EDE。在我们的情况下,仪表理论的参数和EDE的预测属性彼此相关。因此,对EDE特性的宇宙学限制提供了对更高维度理论的见解。

The Hubble constant estimated from the CMB measurements shows large disagreement with the locally measured value. This inconsistency is called the Hubble tension and is vastly studied in recent years. Early Dark Energy (EDE) gives a few percent contribution to the total energy density of the universe only at an epoch before the recombination, and it is considered as a promising solution to the tension. A simple realization of EDE is given by dynamics of a scalar field, called the EDE scalar, and models including the EDE scalar are extensively studied in the literature. In this paper, we present a novel EDE scenario based on higher-dimensional gauge theories. An extra component of gauge fields associated with a compact extra dimension behaves as the EDE scalar at low-energy and has a periodic potential, which has a similar form as potentials for pseudo Nambu-Goldstone bosons (PNGB). In a five-dimensional U(1) gauge theory, we show that a scalar field that originates from the gauge field can give EDE through its dynamics in a PNGB type potential with a suitable choice of parameters in the theory. We focus on the scenario where EDE is explained by the scalar field and clarify constraints on the fundamental parameters of the gauge theory, such as the gauge coupling, the compactification scale, and the mass parameters for matter fields. We also find that a sufficient dilution of EDE requires non-trivial relations among U(1) charges of matter fields. With specific matter contents, we numerically solve the time evolution of the scalar field and confirm that its energy density behaves as an EDE. In our scenario, the parameters of the gauge theory and predicted properties of EDE are related to each other. Thus, the cosmological restrictions on the EDE properties provide insights into higher-dimensional gauge theories.

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