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Stable cosmology in ghost-free quasidilaton theory

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We present a novel cosmological solution in the framework of extended quasidilaton theory which underwent scrutiny recently. We only consider terms that do not generate the Boulware-Deser degree of freedom, hence the "ghost-free" quasidilaton theory, and show three new branches of cosmological evolution therein. One of the solutions passes the perturbative stability tests. This new solution exhibits a late time self-acceleration and all graviton polarizations acquire masses that converge to a constant in the asymptotic future. Moreover, all modes propagate at the speed of light. We propose that this solution can be used as a benchmark model for future phenomenological studies.
Original languageEnglish
JournalPhysical Review D
Issue number4
Publication statusPublished - 29 Aug 2017


  • 1707.02004v1

    Rights statement: The final published version of this article by A. Emir Gümrükçüoğlu, 'Stable cosmology in ghost-free quasidilaton theory,' Phys. Rev. D. 96, 044041, can be located online at © 2017 American Physical Society.

    Accepted author manuscript (Post-print), 229 KB, PDF document

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