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Paper   IPM / P / 15108
School of Physics
  Title:   New Bi-Gravity from New Massive Garvity
1.  A. Akhavan
2.  M. Alishahiha
3.  A. Naseh
4.  A. Nemati
5.  A. Shirzad
  Status:   Published
  Journal: JHEP
  Vol.:  1605
  Year:  2016
  Pages:   006
  Supported by:  IPM
Using the action of three dimensional New Massive Gravity (NMG) we construct a new bi-gravity in three dimensions. This can be done by promoting the rank two auxiliary field appearing in the expression of NMG's action into a dynamical field. We show that small fluctuations around the AdS vacuum of the model are non-tachyonic and ghost free within certain range of the parameters of the model. We study central charges of the dual field theory and observe that in this range they are positive too. This suggests that the proposed model might be a consistent three dimensional bi-gravity.

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