标题： 高斯-邦内特动态紧致化情景及其张量部分的鬼粒子 显示英文标题

标题： Gauss-Bonnet dynamical compactification scenarios and their ghosts in the tensor sectors

摘要： 在宇宙学背景下，爱因斯坦-高斯-邦尼理论在$d+4$维度中包含一种动态紧化场景，在这种场景中，额外维度会稳定到具有常数径向子/尺度因子的配置。然而，这项工作表明，这种相当有吸引力的框架存在不稳定性，要么来自背景配置的不稳定性，要么来自张量扰动的鬼魅行为。通过放松定义原始紧化场景的一个假设，找到了新的且稳定的解决方案。然而，这些配置不满足引力波传播速度的当前限制，因此必须被排除。因此，这些结果倡导对高斯-邦尼框架中的紧化场景进行全面研究，包括它们的稳定性以及物质引入的影响。 显示英文摘要

摘要： In a cosmological context, the Einstein-Gauss-Bonnet theory contains, in $d+4$ dimensions, a dynamical compactification scenario in which the additional dimensions settle down to a configuration with a constant radion/scale factor. Sadly however this work demonstrates that such a quite appealing framework is plagued by instabilities, either from the background configuration's unsteadiness or the ghostly behaviors of the tensorial perturbations. New and stable solutions are found by relaxing one of the hypotheses defining the original compactification scenario. However, such configurations do not respect the current bounds on the speed of propagation of gravitational waves, and thus have to be discarded. Those results thus advocate for a comprehensive study of compactification scenarios in the Gauss-Bonnet framework, their stability, and the effects of matter inclusion.