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Accelerating universe as a result of an adjustment mechanism

P. Martín-Moruno, N. J. Nunes

Abstract
In this essay, we propose that the theory of gravity’s vacuum is described by a de Sitter geometry. Under this assumption, we consider an adjustment mechanism able to screen any value of the vacuum energy of the matter fields. We discuss the most general scalar–tensor cosmological models with second-order equations of motion that have a fixed de Sitter critical point for any kind of material content. These models give rise to interesting cosmological evolutions that we shall discuss.

Keywords
Dark energy - alternative theories of gravity - cosmology

International Journal of Modern Physics D
Volume 24, Number 2, Page 1544018_33
2015 November

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia