An investigation into the dark energy associated with cosmological initial conditions through observations on CMB and the large-scale structure of the universe

通过对宇宙微波背景和宇宙大尺度结构的观测，研究与宇宙学初始条件相关的暗能量

基本信息

批准号：
20J13640
负责人：
南岳
金额：
$ 1.34万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-24 至 2022-03-31
项目状态：
已结题

项目摘要

Dark energy is generally considered as a repulsive homogeneous background driving the accelerated expansion in the standard ΛCDM cosmology following the cosmological principle that assumes homogeneity and isotropy on the largest scales. In addition to tensions and anomalies in observations challenging the ΛCDM model, increasing observations indicate the possible breakdown of the cosmological principle.Dark energy is a mystery to be illuminated in the future decades, whose nature may reveal the fate of our Universe, and the secrets of new physics beyond the standard models of cosmology and particle physics. It will be ground-breaking if dark energy inhomogeneities are found in future observations.This research focuses on a general formulation of possible dark energy inhomogeneities as a modification to the standard perturbation theory as a forecasting effort, a step forward from the long-lasting consideration of dynamical dark energy models. Sourced by some ultralight scalar field, dark energy carries isocurvature-type superhorizon fluctuations. These fluctuations translate into inhomogeneous dark energy clustering and consequently anisotropies in cosmological observables within the horizon. Using constraints on these fluctuations from the initial conditions of the cosmic microwave background, the research formulated and discussed the impacts of dark energy clustering on observables such as dark energy equation of state, luminosity distance and matter spectrum of the large-scale structure, which are worth testing by future surveys like Subaru PFS, DESI, LSST, etc.

遵循宇宙学原理，在最大规模上假定均匀性和同性恋，沿标准λCDM宇宙学中的加速扩张驱动了黑暗能量的均匀背景。除了观测中的紧张局势和异常外，观察结果的增加表明了宇宙学原理的崩溃。dark能量在未来的几十年中被照亮是一种神秘的神秘，其性质可能揭示了我们宇宙的命运，以及除了宇宙学和粒子物理学的标准模型之外，新物理学的秘密。如果在未来的观察中发现了暗能量不均匀性，这将是开创性的。本研究的重点是可能的暗能量不均匀性的一般公式，作为对标准扰动理论的修改，作为预测努力，这是从对动态黑能模型的持久考虑方面向前迈进的一步。深色能源通过一些超轻型标量场来源，带有等化型超耐型式波动。这些波动转化为不均匀的暗能量聚类，因此在宇宙学可观察到地平线内的各向异性。该研究使用宇宙微波背景的初始条件对这些波动的限制进行了限制，并讨论了深色能量聚类对可观察到物品的影响，例如状态的暗能量等效性，大规模结构的光度距离和物质频谱，这些结构是值得的，如未来的诸如Subaru PFS，subaru pfs，desi，lsst等的未来测试值得测试