Quintessential inflation from a variable cosmological constant in a 5D vacuum

Details Quintessential inflation from a variable cosmological constant in a 5D vacuum Quintessential inflation from a variable cosmological constant in a 5D vacuum

2006-06-28

arxiv.org/abs/gr-qc/0606119v3

Phys.Lett.B641:125-129,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

final version (figure included)

Scientific paper

10.1016/j.physletb.2006.08.043

We explore an effective 4D cosmological model for the universe where the variable cosmological constant governs its evolution and the pressure remains negative along all the expansion. This model is introduced from a 5D vacuum state where the (space-like) extra coordinate is considered as noncompact. The expansion is produced by the inflaton field, which is considered as nonminimally coupled to gravity. We conclude from experiental data that the coupling of the inflaton with gravity should be weak, but variable in different epochs of the evolution of the universe.

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