http://arxiv.org/abs/1311.2472
In this methodological note we discuss some details and pecularities of the cosmic expansion as viewed by a realistic observer. We show that the velocity $v_\Theta$ related to a change (measured by observer’s clock) of the angular distance, plays an important role in formation of a meaningful observed picture of the expansion of the universe. Usage of this velocity and the angular distance (in addition to the standard approach — proper distance and corresponding velocity) allows to present the cosmic expansion in a more illustrative manner. These parameters are the most important in visualisation of the expansion.
Tue, 12 Nov 13
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