期刊
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
卷 17, 期 11, 页码 1981-1989出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271808013790
关键词
Cosmology; high dimensions
资金
- CONICYT [1051086, 1030469, 1040624]
- University of Buenos Aires
- Direccion de Investigacion de la Universidad del Bio-Bio
- Consejo Nacional de Investigaciones Cientificas y Tecnicas
We illustrate how a group of symmetry transformations, which preserve the form of the n-dimensional flat Friedmann-Robertson-Walker cosmologies satisfying Einstein's equations, act in any dimension. This group relates the energy density and the isotropic pressure of the cosmic fluid to the expansion rate. The freedom associated with the dimension of the space-time yields assisted inflation even when the energy density of the fluid is a dimensional invariant and enriches the set of duality transformations leading to phantom cosmologies.
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