标题： 任何标准宇宙学的共形隐匿性 显示英文标题

标题： The Conformal Stealth of any Standard Cosmology

摘要： 显示任何各向同性和各向均匀的宇宙，无论其空间拓扑和物质内容如何，都允许存在一个共形隐匿，即一个非平凡的共形不变标量场，其能量-动量张量为零，随着宇宙演化而不会引起哪怕是最小的反作用。令人惊讶的是，这个引力不可见的普遍见证是不均匀的，对基础宇宙学没有影响。此外，还显示这些结果并非四维宇宙所独有，通过将其推广到更高维度，证明了这一点。 显示英文摘要

摘要： It is shown that any homogeneous and isotropic universe, independently of its spatial topology and matter content, allows for the presence of a conformal stealth, i.e. a nontrivial conformally invariant scalar field with vanishing energy-momentum tensor, which evolves along with the universe without causing even the smallest backreaction. Surprisingly, this gravitationally invisible universal witness is inhomogeneous with zero consequences for the underlying cosmology. Additionally, it is shown that these results are not exclusive of a four-dimensional universe by generalizing them to higher dimensions.