五维N膜模型的四维描述
A four-dimensional description of five-dimensional N-brane models
摘要：
我们提出了一种新的方法，获得四维有效引力理论的五维braneworld模型与任意数量的膜在低能区，基于一个两个长度尺度的扩展。该方法是直接的和计算效率，并适用于紧化和非紧化模型。特别强调的是放在模型的辐射模式的行为，而大规模的有效领域自动截断。一般情况下，辐射模形成一个（N-1）维非线性西格玛模型。我们说明了一个N膜模型在非紧化的额外维的方法。
英文摘要：
We propose a new method for obtaining the four-dimensional effective gravitational theory for five-dimensional braneworld models with arbitrary numbers of branes in a low energy regime, based on a two-lengthscale expansion. The method is straightforward and computationally efficient, and is applicable to both compactified and uncompactified models. Particular emphasis is placed on the behavior of the radion modes of the model, while the massive effective fields are automatically truncated. Generally, the radion modes are found to form a (N-1)-dimensional nonlinear sigma model. We illustrate the method for a N-brane model in an uncompactified extra dimension.
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