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Constraints on dark energy models from the Horndeski theory

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Title
Constraints on dark energy models from the Horndeski theory
Author(s)
Bilguun Bayarsaikhan; Seoktae Koh; Enkhbat Tsedenbaljir; Gansukh Tumurtushaa
Subject
INFLATION, ; LAMBDA
Publication Date
2020-11
Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.2020, no.11, pp.1 - 19
Publisher
IOP PUBLISHING LTD
Abstract
In light of the cosmological observations, we investigate dark energy models from the Horndeski theory of gravity. In particular, we consider cosmological models with the derivative self-interaction of the scalar field and the derivative coupling between the scalar field and gravity. We choose the self-interaction term to have an exponential function of the scalar field with both positive and negative exponents. For the function that has a positive exponent, our result shows that the derivative self-interaction term plays an important role in the late-time universe. On the other hand, to reproduce the right cosmic history, the derivative coupling between the scalar field and gravity must dominate during the radiation-dominated phase. However, the importance of such a coupling in the present universe found to be negligible due to its drastic decrease over time. Moreover, the propagation speed of gravitational waves estimated for our model is within the observational bounds, and our model satisfies the observational constraints on the dark energy equation of state.
URI
https://pr.ibs.re.kr/handle/8788114/9113
DOI
10.1088/1475-7516/2020/11/057
ISSN
1475-7516
Appears in Collections:
Center for Fundamental Theory(순수물리이론 연구단) > 1. Journal Papers (저널논문)
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