A sextic ghost condensate dark energy model is shown to produce a matter-density-dependent correction to the Newtonian potential and a frequency-dependent gravitational wave speed in de Sitter spacetime.
No consistent bimetric gravity?
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abstract
We discuss the prospects for a consistent, nonlinear, partially massless (PM), gauge symmetry of bimetric gravity (BMG). Just as for single metric massive gravity, we show that consistency of BMG relies on it having a PM extension; we then argue that it cannot.
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Extended Effective Field Theory of Dark Energy: Ghost Condensate Dark Energy with Sextic Dispersion Relation in de Sitter Spacetime
A sextic ghost condensate dark energy model is shown to produce a matter-density-dependent correction to the Newtonian potential and a frequency-dependent gravitational wave speed in de Sitter spacetime.