Matter coupling in partially constrained vielbein formulation of massive gravity

Antonio De Felice, A. E. Gumrukcuoglu, Lavinia Heisenberg, Shinji Mukohyama

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Abstract

We consider a linear effective vielbein matter coupling without introducing the Boulware-Deser ghost in ghost-free massive gravity. This is achieved in the partially constrained vielbein formulation. We first introduce the formalism and prove the absence of ghost at all scales. As next we investigate the cosmological application of this coupling in this new formulation. We show that even if the background evolution accords with the metric formulation, the perturbations display important different features in the partially constrained vielbein formulation. We study the cosmological perturbations of the two branches of solutions separately. The tensor perturbations coincide with those in the metric formulation. Concerning the vector and scalar perturbations, the requirement of absence of ghost and gradient instabilities yields slightly different allowed parameter space.

Original languageEnglish
Article number003
JournalJournal of Cosmology and Astroparticle Physics
Volume2016
Issue number1
DOIs
Publication statusPublished - 4 Jan 2016
Externally publishedYes

Keywords

  • cosmological perturbation theory
  • dark energy theory
  • gravity
  • modified gravity

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