标题： 匹配时空的线性扰动：规范问题与背景对称性 显示英文标题

标题： Linear perturbations of matched spacetimes: the gauge problem and background symmetries

摘要： 我们对匹配时空的线性扰动研究进行了关键回顾，包括规范问题。 我们分析了背景对称性在扰动匹配中引入的自由度，并重新审视了n维球对称性的特殊情况。 此分析包括具有边界层的情况，如膜世界模型和壳宇宙学。 显示英文摘要

摘要： We present a critical review about the study of linear perturbations of matched spacetimes including gauge problems. We analyse the freedom introduced in the perturbed matching by the presence of background symmetries and revisit the particular case of spherically symmetry in n-dimensions. This analysis includes settings with boundary layers such as brane world models and shell cosmologies.