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

AGUSTIN MEMBIELA; MAURICIO BELLINI

PHYSICS LETTERS B

Elsevier Science

Lugar: Amsterdam; Año: 2006 vol. 641 p. 125 - 129

0370-2693

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 experimental data that the coupling of the inflaton with gravity should be weak, but variable in different epochs of the evolution of the universe.