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Well-tempered cosmology

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

Authors

William T. Emond

Chunhao Li

Paul M. Saffin

Shuang-Yong Zhou



Abstract

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.

Journal Article Type Article
Publication Date May 22, 2019
Journal Journal of Cosmology and Astroparticle Physics
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2019
Issue 05
Article Number 038
APA6 Citation Emond, W. T., Li, C., Saffin, P. M., & Zhou, S. (2019). Well-tempered cosmology. Journal of Cosmology and Astroparticle Physics, 2019(05), doi:10.1088/1475-7516/2019/05/038
DOI https://doi.org/10.1088/1475-7516/2019/05/038
Keywords Astronomy and Astrophysics
Publisher URL https://iopscience.iop.org/article/10.1088/1475-7516/2019/05/038
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