Journal
PHYSICAL REVIEW D
Volume 100, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.100.063531
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Funding
- JSPS KAKENHI [JP17H02894, JP17J00216, JP17K18778, JP15H05895, JP17H06359, JP18H04589]
- JSPS Bilateral Joint Research Projects (JSPS-NRF Collaboration) String Axion Cosmology
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We study Kaluza-Klein cosmology in cuscuton gravity and find an exact solution describing an accelerating four-dimensional universe with a stable extra dimension. A cuscuton which is a nondynamical 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.
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