标题： 膜宇宙学中的标量扰动 显示英文标题

标题： Scalar perturbations in braneworld cosmology

摘要： 我们通过数值求解耦合的体和膜主波动方程，研究了辐射主导时代Randall-Sundrum膜宇宙学中标量扰动的行为。 我们发现，波长小于临界值（由体曲率长度决定）的密度扰动在视界重新进入时会被放大。 这意味着辐射时代物质功率谱在小尺度上至少比广义相对论（GR）的预测大一个数量级。 相反，我们通过模拟明确确认，在大尺度上光谱与GR相同。 尽管这种放大对宇宙微波背景或大尺度结构测量无关，但它将对Randall-Sundrum模型中原初黑洞的形成产生一定影响。 显示英文摘要

摘要： We study the behaviour of scalar perturbations in the radiation-dominated era of Randall-Sundrum braneworld cosmology by numerically solving the coupled bulk and brane master wave equations. We find that density perturbations with wavelengths less than a critical value (set by the bulk curvature length) are amplified during horizon re-entry. This means that the radiation era matter power spectrum will be at least an order of magnitude larger than the predictions of general relativity (GR) on small scales. Conversely, we explicitly confirm from simulations that the spectrum is identical to GR on large scales. Although this magnification is not relevant for the cosmic microwave background or measurements of large scale structure, it will have some bearing on the formation of primordial black holes in Randall-Sundrum models.