权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Cosmological constraints on scalar filed as a candidate of dark energy

作为暗能量候选者提出的标量的宇宙学约束

基本信息

批准号：
14540271
负责人：
YAHIRO Masanobu
金额：
$ 2.3万
依托单位：
KYUSHU UNIVERSITY (2004)University of the Ryukyus (2002-2003)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540271/
关键词：
dark matter braneworld cosmology big bang nucleosynthesis cosmic microwave background type IA supernova observation 実証論的宇宙論 Brane-world宇宙論銀河団 Quintessence

项目摘要

This research analyzed the origin of the dark matter and the possibility of higher dimensional spacetime from the viewpoint of the Quintessence model (self-interacting scalar field model) and the higher-dimensional cosmology. The Randall-Sundrum model is one of the most interesting models among various types of higher-dimensional cosmologies proposed so far. In the model, our universe is described as a membrane (brane) of four dimensions which appears in the five dimensional spacetime. The validity of these models was analyzed by using three important observations (big bang nucleosynthesis, cosmic microwave background, type IA supernova observation). A main conclusion is summarized in the following.1.The amount of darkness radiation, which is generated by the gravity in the higher dimensional spacetime, was constrained by the three observations.2.Assuming the dark matter is the massive particle which can be described as the five-dimensional scalar field, we showed that the dark matter is trapped on our brane only during a limited time.3.Using the result of 2,we proposed a model called "disappearing dark matter", in which the dark matter trapped on the brane decays into the higher-dimensional spacetime in a finite time. The decaying time was estimated by the three observations. The life time was found to be around the cosmic age.4.We derived Newton's law in the Randall-Sundrum model in which the model parameter is tuned to have the positive cosmological constant. The resultant form is different from the inverse square law at small distance.

本研究从Quintessence模型(自作用标量场模型)和高维宇宙学的角度分析了暗物质的起源和高维时空的可能性。兰德尔-桑德鲁姆模型是迄今为止提出的各种类型的高维宇宙中最有趣的模型之一。在该模型中，我们的宇宙被描述为四维的膜(膜)，它出现在五维时空中。利用三个重要的观测数据(大爆炸核合成、宇宙微波背景、IA型超新星观测)分析了这些模型的有效性。主要结论如下：1.由引力在高维时空中产生的暗辐射受到三种观测结果的制约。2.假设暗物质是可描述为五维标量场的大质量粒子，我们证明了暗物质只在有限的时间内被囚禁在我们的膜上。3.利用2的结果，我们提出了一个被捕获在膜上的暗物质在有限时间内衰变到高维时空的模型。通过三次观测估算了衰变时间。发现其寿命约为宇宙年龄。4.在模型参数为正宇宙常数的兰德尔-桑德鲁姆模型中，我们推导出了牛顿定律。在较小的距离处，其结果形式不同于平方反比定律。

项目成果

期刊论文数量（43）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Scalar field localization on a brane with cosmological constant

具有宇宙学常数的膜上的标量场局域化

DOI：
发表时间：
2003
期刊：
Classical and Quantum Gravity 20
影响因子：
0
作者：
K.Ghoroku;M.Yahiro
通讯作者：
M.Yahiro

Determination of S(17) from Be7(d, n)8B reaction : CDCC analyses based on three-body model

Be7(d, n)8B 反应中 S(17) 的测定：基于三体模型的 CDCC 分析

DOI：
发表时间：
2003
期刊：
Physical Review C67
影响因子：
0
作者：
K.Ghoroku;M.Yahiro;Ghoroku et al.;T.Matsurmoto et al.;K.Ogata et al.;K.Ichiki et al.;K.Ogata et al.
通讯作者：
K.Ogata et al.

Y.Yahiro, G.J.Mathews, K.Ichiki, T.Kajino, M.Orito: "Constraints on cosmic quintessence and quintessential inflation"Physical Review. D65. 063502 (2002)

Y.Yahiro、G.J.Mathews、K.Ichiki、T.Kajino、M.Orito：“对宇宙本质和典型膨胀的约束”物理评论。