2023/01/22 by H. L. Dao, Dao, H. L.
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2301.09064
In this work, which is a follow-up of arXiv:2102.06512, we document new cosmological solutions from four-dimensional N=4 matter-coupled supergravity. The solutions smoothly interpolate between a dS2× S2 spacetime at t→ -∞ and a dS4 spacetime at t→ +∞ and arise from the second-order equations of motion. Unlike the previously reported solutions in arXiv:2102.06512 that involve the diagonal U(1) subgroup of both the electric and magnetic factors in the gauging, these solutions only require a single U(1) factor from either the electric or magnetic part. Two additional features of these solutions that distinguish them from the previously presented solutions are the nonvanishing value of the dilaton ϕ and the fact that they are only admitted by the type II de-Sitter gauged theories.