2021/01/28 by Dao, H. L.
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th)
paper · doi:10.48550/arxiv.2101.11905
From five-dimensional N=4 matter-coupled gauged supergravity, smooth time-dependent cosmological solutions, connecting a dS5-d× Hd (with d=2,3) spacetime at early times to a dS5 spacetime at late times, are presented. The solutions are derived from the second-order equations of motion arising from all the gauged theories that can admit dS5 solutions. There are eight such theories constructed from gauge groups of the form SO(1,1)× Gnc and SO(1,1)(n)diag× Gnc, with n=2,3, where Gnc is a non-compact gauge factor whose compact part must be embedded entirely in the matter symmetry group of 5D matter-coupled supergravity. Furthermore, we analyze how the cosmological solutions and their corresponding dS5 vacua cannot arise from the first-order equations that solve the second-order field equations.