论文标题
静态弹跳宇宙学的通用散射法
Universal scattering laws for quiescent bouncing cosmology
论文作者
论文摘要
宇宙学的弹跳发生在许多重力理论中。我们定义了反弹之前和之后的大规模几何形状（假设没有BKL振荡）的奇异性散射图，并编码了该理论的微观细节。通过对所有适当的本地地图进行分类，我们发现了三个通用定律：Kasner指数的缩放，物质的规范转换，定向度量标准。 Bianchi i在弦理论，循环量子宇宙学和修改物质模型中的弹跳确实遵守了这些。然后，我们的分类确定了不均匀性和各向异性如何穿越弹跳，并精确提取了模型依赖的自由度。
Cosmological bounces occur in many gravity theories. We define singularity scattering maps relating large scale geometries before and after the bounce (assuming no BKL oscillations) and encoding microscopic details of the theory. By classifying all suitably local maps we uncover three universal laws: scaling of Kasner exponents, canonical transformation of matter, directional metric scaling. These are indeed obeyed by Bianchi I bounces in string theory, loop quantum cosmology and modified matter models; our classification then determines how inhomogeneities and anisotropies traverse bounces, and precisely extracts model-dependent degrees of freedom.
