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Continuous matter creation and the acceleration of the universe: the growth of density fluctuations

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Abstract

Cosmologies including continuous matter creation are able to reproduce the main properties of the standard ΛCDM model, in particular in cases where the particle and entropy production rates are equal. These specific models, characterized by a mass density equal to the critical value, behave like the standard ΛCDM model at early times whereas their late evolution is similar to the steady-state cosmology. The maximum amplitude of density fluctuations in these models depends on the adopted creation rate, related here to the parameter Ω v and this limitation could be a difficulty for the formation of galaxies and large-scale structure in this class of universe. Additional problems are related with predictions either of the random peculiar velocities of galaxies or the present density of massive clusters of galaxies, both being largely overestimated with respect to observational data.

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  1. Université de Nice-Sophia Antipolis-Observatoire de la Côte d’Azur, BP 4229, 06304, Nice Cedex 4, France

    Alain de Roany & J. A. de Freitas Pacheco

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  1. Alain de Roany
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  2. J. A. de Freitas Pacheco
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Correspondence to J. A. de Freitas Pacheco.

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de Roany, A., de Freitas Pacheco, J.A. Continuous matter creation and the acceleration of the universe: the growth of density fluctuations. Gen Relativ Gravit 43, 61–72 (2011). https://doi.org/10.1007/s10714-010-1069-2

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  • DOI: https://doi.org/10.1007/s10714-010-1069-2

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