70 research outputs found
Vanishing Dimensions in Four Dimensional Cosmology with Nonminimal Derivative Coupling of Scalar Field
We discussed a mechanism that allows the universe to start from lower
dimension () in its very early era and evolves to four dimension at the
end of the process. The mechanism is generated by a nonminimal derivative
coupling of scalar field, where derivative terms of the scalar field coupled to
curvature tensor. We solve the Einstein equations for a limit of large and
nearly constant Hubble parameter and analyze the evolution of the Hubble
parameter in this limit. The lower-dimensionality in early universe has
advantages in the context of unification theory.Comment: 7 pages, 1 figur
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