Cosmological Solutions in D=6, N=2 Kaluza-Klein Supergravity. Friedmann Universe Without Fine-Tuning

摘要

Two families of cosmological solutions are presented in D=6, N=2 Kaluza-Klein supergravity theories. One family, which is in the case that the universe is in a vacuum state, includes (Minkowski space-time) x (constant sphere S exp 2 ) - solution. The case with 4-dimensional radiation is the other family, which contains (Friedmann universe) x (constant sphere S exp 2 ) - solution. All solutions in the latter family approach the Friedmann universe asymptotically. Four-dimensional cosmological constant vanishes automatically without fine-tuning in both families of solutions. (Atomindex citation 16:028984)