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It is suggested that the apparently disparate cosmological phenomenaattributed to so-called 'dark matter' and 'dark energy' arise from the samefundamental physical process: the emergence, from the quantum level, ofspacetime itself. This creation of spacetime results in metric expansion aroundmass points in addition to the usual curvature due to stress-energy sources ofthe gravitational field. A recent modification of Einstein's theory of generalrelativity by Chadwick, Hodgkinson, and McDonald incorporating spacetimeexpansion around mass points, which accounts well for the observed galacticrotation curves, is adduced in support of the proposal. Recent observationalevidence corroborates a prediction of the model that the apparent amount of'dark matter' increases with the age of the universe. In addition, the proposalleads to the same result for the small but nonvanishing cosmological constant,related to 'dark energy, as that of the causet model of Sorkin et al.

Are Dark Energy and Dark Matter Different Aspects of the Same Physical Process?