Horndeski theories self-tuning to a de Sitter vacuum

Prado Martín-Moruno, Nelson J. Nunes, and Francisco S. N. Lobo
Phys. Rev. D 91, 084029 – Published 13 April 2015

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.

  • Received 9 January 2015

DOI:https://doi.org/10.1103/PhysRevD.91.084029

© 2015 American Physical Society

Authors & Affiliations

Prado Martín-Moruno*, Nelson J. Nunes, and Francisco S. N. Lobo

  • Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, Faculdade de Ciências, Campo Grande, PT1749-016 Lisboa, Portugal

  • *pmmoruno@fc.ul.pt
  • njnunes@fc.ul.pt
  • fslobo@fc.ul.pt

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Issue

Vol. 91, Iss. 8 — 15 April 2015

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