比例因子可以波动吗？
Can the scale factor be rippled?
摘要：
我们要解决一个问题：宇宙学的尺度因子是一个局部振荡量吗？这个问题是在两个经典的1+1维模型的框架下研究的：第一个是一个字符串对一个弯曲的背景，第二个是一个非均匀的Bianchi我模型。对于弦模型，它表明，存在的规范和初始条件提供了一个振荡的标度因子对一个缓慢发展的背景，这是不受这种振荡的“平均”。对于具有共形时间规范的非齐次Bianchi I模型，一个初始齐次的标度因子可以变为非齐次的，并发生非线性振荡。如图所示，这些非线性振荡可以被视为非线性规范波。
英文摘要：
We address an issue: would the cosmological scale factor be a locally oscillating quantity? This problem is examined in the framework of two classical 1+1-dimensional models: the first one is a string against a curved background, and the second one is an inhomogeneous Bianchi I model. For the string model, it is shown that there exist the gauge and the initial condition providing an oscillation of scale factor against a slowly evolving background, which is not affected by such an oscillation "at the mean". For the inhomogeneous Bianchi I model with the conformal time gauge, an initially homogeneous scale factor can become inhomogeneous and undergo the nonlinear oscillations. As is shown these nonlinear oscillations can be treated as a nonlinear gauge wave.
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。
