额外空间的扭曲加速了宇宙的膨胀
The warping of extra spaces accelerates the expansion of the universe
摘要：
一般的宇宙学模型来自于具有扭曲额外维度的高维理论，在3+1时空或物理3-膜上引入了一个非零的类宇宙学常数项。在这个3+1时空是一个膨胀的德西特“膜”嵌入一个更高维的时空的场景中，由扭曲几何描述，4D宇宙学项是根据两个长度尺度确定的：一个是与额外维度的大小相关的尺度，另一个是与额外空间的扭曲相关的尺度。这个项在四维空间中的存在，提供了一种诱人的可能性，可以从引力的基本理论（例如弦论）解释观测到的宇宙加速膨胀。
英文摘要：
Generic cosmological models derived from higher dimensional theories with warped extra dimensions have a nonzero cosmological constant-like term induced on the 3+1 space-time, or a physical 3-brane. In the scenario where this 3+1 space-time is an inflating de Sitter "brane" embedded in a higher-dimensional space-time, described by warped geometry, the 4D cosmological term is determined in terms of two length scales: one is a scale associated with the size of extra dimension(s) and the other is a scale associated with the warping of extra space(s). The existence of this term in four dimensions provides a tantalizing possibility of explaining the observed accelerating expansion of the universe from fundamental theories of gravity, e.g. string theory.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
