http://arxiv.org/abs/1906.10363
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.
A. Ito, Y. Sakakihara and J. Soda
Wed, 26 Jun 19
38/68
Comments: 10 pages