Stable cosmology in ghost-free quasidilaton theory

Emir Gumrukcuoglu, Kazuya Koyama, Shinji Mukohyama

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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


  • hep-th
  • astro-ph.CO
  • gr-qc
  • RCUK
  • STFC
  • ST/L00044X/1
  • ST/N000668/1


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