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The effect of cosmological background dynamics on the spherical collapse in MOND |
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| Authors: | M Malekjani H Haghi |
| Institution: | a Department of Physics, Faculty of Science, Bu-Ali Sina University, Hamedan 65178, Iran b Department of Physics, Institute for Advanced Studies in Basic Science (IASBS), P.O. Box 45195-1159, Zanjan, Iran c Department of Theoretical Physics and Astrophysics, University of Tabriz, P.O. Box 51664, Tabriz, Iran |
| Abstract: | The effect of background dynamics of the universe on formation of large scale structures in the framework of Modified Newtonian Dynamics (MOND) is investigated. A spherical collapse model is used for modeling the formation of the structures. This study is done in two extreme cases: (i) assuming a universe with a low-density baryonic matter without any cold dark matter and dark energy; (ii) a dark energy dominated universe with baryonic matter, without cold dark matter. We show that for the case (ii) the structures virialize at lower redshifts with larger radii compared to the low-density background universe. The dark energy slow downs the collapse of the structures. We show that our results are compatible with recent simulations of the structure formation in MOND. |
| Keywords: | Gravitation-galaxies Formation-cosmology Theory-dark matter-large scale structure of universe |
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