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| Paper IPM / P / 8572 |
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In this work we study the formation of structures made by baryonic and dark matter components in the framework of top-hat model. Harrison-Zeldovich spectrum is used as the initial condition of the structures at the decoupling epoch. We show that small scale structures as dwarf galaxies and globular clusters evolve faster than the larger ones and we have the down-top scenario for the structure formation in the top-hat model. As the observational test of this model, the power spectrum of the structures is calculated and compared with the 2dFGRS survey and obtained σ8 ∼ 0.8 for this model. We show that in the dark energy models, the structures evolve faster than the ΛCDM one. Finally we discuss the effect of cooling in formation of baryonic structures and estimate a redshift of z ∼ 2 for the star burst era.
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