Gravitational waves in ghost free bimetric gravity
Journal Article
·
· Journal of Cosmology and Astroparticle Physics
- Physics Department, Payame Noor University, 19395-3697 Tehran (Iran, Islamic Republic of)
We obtain a set of exact gravitational wave solutions for the ghost free bimetric theory of gravity. With a flat reference metric, the theory admits the vacuum Brinkmann plane wave solution for suitable choices of the coefficients of different terms in the interaction potential. An exact gravitational wave solution corresponding to a massive scalar mode is also admitted for arbitrary choice of the coefficients with the reference metric being proportional to the spacetime metric. The proportionality factor and the speed of the wave are calculated in terms of the parameters of the theory. We also show that a F(R) extension of the theory admits similar solutions but in general is plagued with ghost instabilities.
- OSTI ID:
- 22279751
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 11 Vol. 2012; ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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