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The effect of background dynamics of the universe on formation of large scalestructures in the framework of Modified Newtonian Dynamics (MOND) isinvestigated. A spherical collapse model is used for modeling the formation ofthe structures. This study is done in two extreme cases: ({\it i}) assuming auniverse with a low-density baryonic matter without any cold dark matter anddark energy; ({\it ii}) a dark energy dominated universe with baryonic matter,without cold dark matter. We show that for the case ({\it ii}) the structuresvirialize at lower redshifts with larger radii compared to the low-densitybackground universe. The dark energy slow downs the collapse of the structures.We show that our results are compatible with recent simulations of thestructure formation in MOND.

The Effect of Cosmological Background Dynamics on the Spherical Collapse in MOND