论文标题
FLRW空位的渐近动力学和电荷
Asymptotic dynamics and charges for FLRW spacetimes
论文作者
论文摘要
我们研究了未来无限无限的渐近和空间平坦的FLRW空间的渐近性。我们发现，通过放松边界条件，可以将差异的渐近代数扩大到最近发现的Weyl-BMS代数的渐近平坦空间。在宇宙学环境中，该代数与BMS代数的先前扩展相反。然后，我们研究具有有限通量的渐近flrw空间的运动方程式，并表明该动力学受到源的能量弹药张的完全约束。最后，我们提出了与宇宙学上译有关的电荷的表达式，其演变方程的具有源自哈勃 - 莱玛特流动的新颖贡献。
We investigate the asymptotia of decelerating and spatially flat FLRW spacetimes at future null infinity. We find that the asymptotic algebra of diffeomorphisms can be enlarged to the recently discovered Weyl-BMS algebra for asymptotically flat spacetimes by relaxing the boundary conditions. This algebra remains undeformed in the cosmological setting contrary to previous extensions of the BMS algebra. We then study the equations of motion for asymptotically FLRW spacetimes with finite fluxes and show that the dynamics is fully constrained by the energy-momentum tensor of the source. Finally, we propose an expression for the charges that are associated with the cosmological supertranslations and whose evolution equation features a novel contribution arising from the Hubble-Lemaître flow.
