RESEARCH
<< back
A Review on the Cosmology of the de Sitter Horndeski Models

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

Abstract
We review the most general scalar-tensor cosmological models with up to second-order derivatives in the field equations that have a fixed spatially flat de Sitter critical point independent of the material content or vacuum energy. This subclass of the Horndeski Lagrangian is capable of dynamically adjusting any value of the vacuum energy of the matter fields at the critical point. We present the cosmological evolution of the linear models and the non-linear models with shift symmetry. We come to the conclusion that the shift symmetric non-linear models can deliver a viable background compatible with current observations.

Keywords
cosmology; dark energy; extensions of general relativity

Universe
Volume 3, Number 2
2017 March

>> ADS>> DOI

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa Fundação para a Ciência e a Tecnologia
OUTREACH
Outreach at IA