Accelerating Universe with a stable extra dimension in cuscuton gravity
arXiv:1906.10363 · doi:10.1103/PhysRevD.100.063531
Abstract
We study Kaluza-Klein cosmology in cuscuton gravity and find an exact solution describing an accelerating 4-dimensional universe with a stable extra dimension. A cuscuton which is a non-dynamical scalar field is responsible for the accelerating expansion and a vector field makes the extra dimensional space stable. Remarkably, the accelerating universe in our model is not exactly de Sitter.
10 pages