论文标题
从PP波到伽利利亚的空间
From pp-Waves to Galilean Spacetimes
论文作者
论文摘要
我们在空间上表现出所有各向同性均质的dimension $（n+1）\ geq 4 $，包括新颖的扭转，因为均匀的pp-wave spaceTimes。我们还表明，PP波是由纯辐射场来源的，并分析了它们的全球性质。
We exhibit all spatially isotropic homogeneous Galilean spacetimes of dimension $(n+1) \geq 4$, including the novel torsional ones, as null reductions of homogeneous pp-wave spacetimes. We also show that the pp-waves are sourced by pure radiation fields and analyse their global properties.
