Open inflationary Universe

开放的暴胀宇宙

• 批准号: 09640355
• 负责人: SASAKI Misao
• 金额: $ 1.66万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640355/
• 关键词: open universe; inflationary universe; false vacuum decay; cosmic microwave background; 開いた宇宙モデル; 量子トンネル現象; 宇宙の大域的構造形成; インフレーション; 量子トンネル効果; 宇宙背景放射; 宇宙論的摂動論; インスタントン; 曲がった時空上での場の理論; 時空の量子揺らぎ; 宇宙の大域的構造

We proposed a scenario of open inflationary universe (one-bubble open inflation), and clarified the relation between a new type of perturbation modes (supercurvature modes) and gravitational wave modes.Then we developed a method to evaluate the perturbations in the single-component scalar field model of open inflation and derived a set of decoupled gauge-invariant equations for the scalar modes and tensor modes. In particular, we clarified the general feature of the tensor perturbation spectrum.Further, we clarified a class of models in which open inflation can be successfully implemented, and investigated the features of perturbation spectra. As a result, we found1.The amplitude of scalar spectrum is suppressed in the long wavelength side relative to the standard scenario of inflation.2.On the other hand, the long wavelength side of tensor spectrum is enhanced.3.Hence the resulting CMB anisotropy spectrum on large angular scales remains scale-invariant.4.As for the density perturbation, the spectrum has a milde peak at scale close to the galaxy scale.These features can be tested observationally in the near future.

提出了一种开放膨胀宇宙(单泡开放膨胀)的设想，阐明了一种新的微扰模(超曲率模)与引力波模式之间的关系，提出了一种计算开放膨胀的单分量标量场模型中微扰的方法，并推导了一组解耦的标量模和张量模的规范不变量方程。特别地，我们阐明了张量微扰谱的一般特征，进一步阐明了一类可以成功实现开放膨胀的模型，并研究了微扰谱的特征。结果发现：1.相对于标准暴涨情形，标量谱在长波长端的振幅受到抑制；2.张量谱的长波长端得到增强.3.由此得到的CMB各向异性谱在大角度尺度上保持标度不变.4.对于密度微扰，该谱在接近星系尺度的尺度上有一个Milde峰.这些特征可以在不久的将来通过观测得到验证.

项目成果

Uchida Gren: "False vacuum decay with gravity in the non-thin-wall limit"Phys. Rev. D. (印刷中). (2000)

Uchida Gren：“非薄壁极限下的假真空衰变”Phys Rev. D.（出版中）。

Misao Sasaki: "Superhorizon scale dynamics in multiscalar inflation"Prog.Theor.Phys.. 99. 763-782 (1998)

Misao Sasaki：“多标量膨胀中的超地平线尺度动力学”Prog.Theor.Phys.. 99. 763-782 (1998)

Andrei Linde, Misao Sasaki, Takahiro Tanaka: "CMB in open inflation"Phys. Rev. D59. 123522 (1999)

Andrei Linde、Misao Sasaki、Takahiro Tanaka：“开放暴胀中的 CMB”Phys。

Jaume Garriga: "Canonical quantization of cosmdogical pertarbations"Nucl.Phys.B. 513. 343-374 (1998)

Jaume Garriga：“宇宙扰动的规范量子化”Nucl.Phys.B。

Takahiro Tanaka and Misao Sasaki: "No supercritical supercurvature modeconjecture in one-bubble open inflation" Physical Review D. 59. 023506 (1999)

Takahiro Tanaka 和 Misao Sasaki：“单泡开放暴胀中没有超临界超曲率模式猜想”物理评论 D. 59. 023506 (1999)