The well-tempered cosmological constant: the Horndeski variations

Appleby, Stephen; Linder, Eric V.

doi:10.1088/1475-7516/2020/12/036

Title: The well-tempered cosmological constant: the Horndeski variations

Journal Article · Tue Dec 29 00:00:00 EST 2020 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2020/12/036· OSTI ID:1837375

Appleby, Stephen ^[1]; Linder, Eric V. ^[2]

Asia Pacific Center for Theoretical Physics, Pohang (Korea)
Univ. of California, Berkeley, CA (United States); Nazarbayev University, Nur-Sultan (Kazakhstan)

Well tempering is one of the few classical field theory methods for solving the original cosmological constant problem, dynamically canceling a large (possibly Planck scale) vacuum energy and leaving the matter component intact, while providing a viable cosmology with late time cosmic acceleration and an end de Sitter state. We present the general constraints that variations of Horndeski gravity models with different combinations of terms must satisfy to admit an exact de Sitter spacetime that does not respond to an arbitrarily large cosmological constant. We explicitly derive several specific scalar-tensor models that well temper and can deliver a standard cosmic history including current cosmic acceleration. Stability criteria, attractor behavior of the de Sitter state, and the response of the models to pressureless matter are considered. The well tempered conditions can be used to focus on particular models of modified gravity that have special interest— not only removing the original cosmological constant problem but providing relations between the free Horndeski functions and reducing them to a couple of parameters, suitable for testing gravity and cosmological data analysis.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1837375

Journal Information:: Journal of Cosmology and Astroparticle Physics, Vol. 2020, Issue 12; ISSN 1475-7516

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Self-tuning kinetic gravity braiding: cosmological dynamics, shift symmetry, and the tadpole Bernardo, Reginald Christian Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 03 https://doi.org/10.1088/1475-7516/2021/03/079	journal	March 2021

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