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2012

On the scalar graviton in n-DBI gravity

Coelho, Flavio S., Herdeiro, Carlos, Hirano, Shinji et al.

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n-DBI gravity is a gravitational theory which yields near de Sitter inflation spontaneously at the cost of breaking Lorentz invariance by a preferred choice of foliation.

We show that this breakdown endows n-DBI gravity with one extra physical gravitational degree of freedom: a scalar graviton.
Its existence is established by Dirac's theory of constrained systems.
Firstly, studying scalar perturbations around Minkowski space-time, we show that there exists one scalar degree of freedom and identify it in terms of the metric perturbations.

On the scalar graviton in n-DBI gravity · Around

Built on

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T. Delsate and J. Steinhoff, “Singular and nonsingular features of Eddington inspired Born-Infeld Gravity,” arXiv:1201.4989 [gr-qc]
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J. Khoury, G. E. J. Miller and A. J. Tolley, “Spatially Covariant Theories of a Transverse, Traceless Graviton, Part I: Formalism,” arXiv:1108.1397 [hep-th]
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Then

C. Charmousis, G. Niz, A. Padilla and P. M. Saffin, “Strong coupling in Horava gravity,” JHEP 0908
Original
2009
Later among the works it cites.
D. Blas, O. Pujolas and S. Sibiryakov, “Consistent Extension of Horava Gravity,” Phys. Rev. Lett. 104
Original
2010
Later among the works it cites.
M. Henneaux, A. Kleinschmidt and G. Lucena Gomez, “A dynamical inconsistency of Horava gravity,” Phys. Rev. D 81
Original
2010
Later among the works it cites.
C. Herdeiro, S. Hirano and Y. Sato, “n-DBI gravity,” Phys. Rev. D 84
Original
2011
Later among the works it cites.
C. Herdeiro and S. Hirano, “Scale invariance and a gravitational model with non-eternal inflation,” JCAP 1205
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