标题： 额外空间的扭曲加速了宇宙的膨胀 显示英文标题

标题： The warping of extra spaces accelerates the expansion of the universe

摘要： 从高维理论中导出的通用宇宙模型，具有在3+1时空或物理3膜上诱导的类似宇宙常数的非零项。 在该3+1时空是一个嵌入更高维时空中的膨胀德西特“膜”的场景中，由扭曲几何描述，4D宇宙常数项是通过两个长度尺度来确定的：一个是与额外维大小相关的尺度，另一个是与额外空间扭曲相关的尺度。 四维中存在这一项为从引力的基本理论（例如弦理论）解释观测到的宇宙加速膨胀提供了诱人的可能性。 显示英文摘要

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.