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If the expansion of the universe is accelerating, doesn't that mean that the entire universe is a non-inertial frame of reference? And if so, what implications does this have (if any)?

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Frame of reference should be defined at single point, or you palling to shrink whole universe to a point?, even so being our earth is not inertial frame of reference, Astronomers includes that in there measures, and it's not enough to describe the expansion. –  TMS Dec 2 '12 at 21:40
    
Note: In GR, generally there cannot be any global inertial frame of references, only local ones. –  namehere Dec 3 '12 at 11:13

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No. The expansion of the universe and the accelerated expansion is simply a scale factor change, not any kind of motion at all. For there to be a real acceleration there would have to be a preferred direction to the acceleration. The universe is isotropic so there is no direction for the acceleration, the scale factor change simply increases the distance between any pair of points.

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