Publication: Mass-varying massive gravity with k-essence
Issued Date
2016-01-01
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ISSN
14346052
14346044
14346044
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2-s2.0-84954519223
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Mahidol University
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SCOPUS
Bibliographic Citation
European Physical Journal C. Vol.76, No.1 (2016), 1-11
Suggested Citation
Lunchakorn Tannukij, Pitayuth Wongjun Mass-varying massive gravity with k-essence. European Physical Journal C. Vol.76, No.1 (2016), 1-11. doi:10.1140/epjc/s10052-015-3872-0 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/40640
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Title
Mass-varying massive gravity with k-essence
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Abstract
© 2016, The Author(s). For a large class of mass-varying massive-gravity models, the graviton mass cannot provide the late-time cosmic expansion of the universe due to its vanishing at late time. In this work, we propose a new class of mass-varying massive gravity models, in which the graviton mass varies according to a kinetic term of a k-essence field. By using a more general form of the fiducial metric, we found a solution such that a non-vanishing graviton mass can drive the accelerated expansion of the universe at late time. We also perform dynamical analyses of such a model and find that without introducing the k-essence Lagrangian, the graviton mass can be responsible for both dark contents of the universe, namely dark energy, which drives the accelerated expansion of the universe, and non-relativistic matter, which plays the role of dark matter. Moreover, by including the k-essence Lagrangian, we find that it is possible to alleviate the so-called cosmic coincidence problem.