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Well-tempered cosmology

Emond, William T.; Li, Chunhao; Saffin, Paul M.; Zhou, Shuang-Yong


William T. Emond

Chunhao Li

Shuang-Yong Zhou


We examine an approach to cosmology, known as Well-Tempering, that allows for a de Sitter phase whose expansion is independent of the cosmological constant. Starting from a generic scalar-tensor theory compatible with the recent gravitational wave observation, we impose the Well-Tempering conditions and derive a system that is capable of tuning away the cosmological constant within a sub-class of Horndeski theory, where the scalar has a canonical kinetic term and a general potential. This scenario improves upon the Fab-Four approach by allowing a standard fluid-cosmology before entering the de Sitter phase, and we present an explicit example of our general solution.


Emond, W. T., Li, C., Saffin, P. M., & Zhou, S. (2019). Well-tempered cosmology. Journal of Cosmology and Astroparticle Physics, 2019(05),

Journal Article Type Article
Acceptance Date May 7, 2019
Online Publication Date May 22, 2019
Publication Date May 22, 2019
Deposit Date May 24, 2019
Publicly Available Date May 23, 2020
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2019
Issue 05
Article Number 038
Keywords Astronomy and Astrophysics
Public URL
Publisher URL


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