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2013

PPN expansion and FRW scalar perturbations in n-DBI gravity

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

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n-DBI gravity explicitly breaks Lorentz invariance by the introduction of a unit time-like vector field, thereby giving rise to an extra (scalar) degree of freedom.

We look for observational consequences of this mode in two setups.
Firstly, we compute the parametrized post-Newtonian (PPN) expansion of the metric to first post-Newtonian order.
Surprisingly, we find that the PPN parameters are exactly the same as in General Relativity (GR), and no preferred-frame effects are produced.

PPN expansion and FRW scalar perturbations in n-DBI gravity · Around

Built on

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D. Blas, O. Pujolas and S. Sibiryakov, “On the Extra Mode and Inconsistency of Horava Gravity,” JHEP 0910
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