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Horndeski theories self-tuning to a de Sitter vacuum

P. MartÝn-Moruno, N. J. Nunes, F. S. N. Lobo

Abstract
We consider Horndeski cosmological models able to screen the vacuum energy coming from any field theory assuming that after this screening the space should be in a de Sitter vacuum with a particular value of the cosmological constant specified by the theory of gravity itself. The most general scalar-tensor cosmological models without higher than second order derivatives in the field equations that have a spatially flat de Sitter critical point for any kind of material content or vacuum energy are, therefore, presented. These models could allow us to understand the current accelerated expansion of the Universe as the result of a dynamical evolution towards a de Sitter attractor.

Physical Review D
Volume 91, Issue 8, Page 084029
2015 April

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Instituto de Astrof├şsica e Ci├¬ncias do Espa├žo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Funda├ž├úo para a Ci├¬ncia e a Tecnologia
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