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The evolution of space-time and matters in the very early universe

早期宇宙中时空和物质的演化

基本信息

批准号：
14102004
负责人：
SATO Katsuhiko
金额：
$ 53.33万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (S)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2006
项目状态：
已结题

项目摘要

1. We proposed the delta-N formalism to treat the non-linear fluctuations at super-Hubble horizon scale. This provides us the powerful tool to link the very early universe to observational quantities. This formalism is often used by many peoples who are interested in the non-linear effects in cosmology.2. We proved the uniqueness theorem of static, asymptotically flat black holes in higher dimensions. While there is the Hawking's topology theorem in four dimensions, that is, the topology of event horizon is 2-sphere, this is not the case in higher dimensions. However, our new theorem implies that static black holes have topology of sphere.3. The genesis of Lepton, i. e., Leptogenesis, is most promising mechanism to explain the baryon number observed today. In this mechanism, we proposed a new model which explains the baryon number by the sign of the CP-violation in neutrino oscillations.4. We explored the gravitino decay process during the Big-bang nucleosynthesis and then had the limi … More t to the hadronic decay. This result provides us a strong limit on inflation models and baryogenesis.5. We investigated the evaporation of primordial black holes (PBH) formed in braneworld context. More precisely, using the observational limit on the gamma ray background and the abundance of anti-protons, we could have the limit on the abundance of PBH, the size of extra dimensions and so on.6. With high-resolution N-body simulations, we constructed the triaxial modeling halo density profiles empirically. Then we could explain the observed gravitational arc statistics with this model. This is first time to explain that.7. With Sloan Digital Sky Survey (SDSS) data we found that the evolution of non-Gaussian feature of probability distribution function (PDF) depends on the class of galaxies. Since we could pick up the secondary cause of the appearance of non-Gaussianity through the evolution of galaxy, we could have the basics to explore the initial condition for the density fluctuations. Less

1.提出了在超哈勃视界尺度下处理非线性涨落的Delta-N公式。这为我们提供了将非常早期的宇宙与观测量联系起来的强大工具。这种形式主义经常被许多对宇宙学中的非线性效应感兴趣的人使用。我们证明了高维静态渐近平坦黑洞的唯一性定理。虽然在四维空间中存在霍金的拓扑定理，即事件视界的拓扑是2-球面的，但在更高的维度上却不是这样。然而，我们的新定理意味着静态黑洞具有球面拓扑。轻子的起源，即轻子发生，是解释今天观察到的重子数的最有希望的机制。在这个机制中，我们提出了一个新的模型，用中微子振荡中CP破坏的符号来解释重子数。我们探索了大爆炸核合成过程中的引力微子衰变过程，然后有了LiMi…更重要的是强子衰变。这一结果为我们提供了一个关于膨胀模型和重力源的强极限。研究了在膜世界背景下形成的原始黑洞(PBH)的蒸发。更准确地说，利用伽马射线背景的观测极限和反质子的丰度，我们可以对PBH的丰度、额外维度的大小等进行限制。通过高分辨率的N体模拟，我们经验地建立了三轴模拟的晕密度剖面。然后，我们可以用这个模型来解释观测到的引力弧统计数据。这是第一次解释这一点。利用斯隆数字巡天(SDSS)数据，我们发现概率分布函数(PDF)的非高斯特征的演化依赖于星系的类别。由于我们可以通过星系的演化获得非高斯性现象出现的次要原因，所以我们就有了探索密度起伏的初始条件的基础。较少

项目成果

期刊论文数量（148）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Statistical significance of small scale anisotropy in arrival directions of ultra-high energy cosmic rays

超高能宇宙线到达方向小尺度各向异性的统计意义

DOI：
发表时间：
2004
期刊：
Astrophysical Journal 614
影响因子：
0
作者：
Akiharu;Itoh;Hiroyuki Yoshiguchi;Shinji Mukohyama;Hajime Takami;Hiroyuki Yoshiguchi;Hiroyuki Yoshiguchi;Hiroyuki Yoshiguchi
通讯作者：
Hiroyuki Yoshiguchi

S.Ando et al.: "Resonant spin-flavor conversion of supernova neutrinos : Dependence on presupernova models and future prospects"Phys.Rev.D. 68. 023003 (2003)

S.Ando 等人：“超新星中微子的共振自旋味道转换：对超新星前模型的依赖和未来前景”Phys.Rev.D.