* Not everyone is happy with the methodology used by those reporting this result. We'll see how that shakes out, and the finer data from the upcoming Planck satellite may give a clear-cut answer.
* You can have superluminal disturbances in Einstein gravity, but not in the Newtonian limit. There are theories of modified gravity with superluminal perturbations, but they have other defects that make them untenable.
* An alternative explanation consistent with Einstein gravity is that disturbances during an era of cosmic inflation might not have been symmetric. Part of this disturbance is now outside our horizon, creating this "dark flow."
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* Not everyone is happy with the methodology used by those reporting this result. We'll see how that shakes out, and the finer data from the upcoming Planck satellite may give a clear-cut answer.
* You can have superluminal disturbances in Einstein gravity, but not in the Newtonian limit. There are theories of modified gravity with superluminal perturbations, but they have other defects that make them untenable.
* An alternative explanation consistent with Einstein gravity is that disturbances during an era of cosmic inflation might not have been symmetric. Part of this disturbance is now outside our horizon, creating this "dark flow."