Density perturbations in a flat universe |
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| Authors: | Marcelo Samuel Berman |
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| Institution: | (1) Dept. of Astronomy, University of Florida, 211 SSRB, 32611 Gainesville, FL, USA;(2) Present address: Departamento de Ciencias Exatas, Faculdade de Filosofia, Ciencias e Letras da FURJ, 89200 Joinville, SC, Brazil |
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| Abstract: | A well-known solution, for a flat model in general relativity obeying the Robertson-Walker metric, a perfect fluid energy-tensor and a perfect gas law of state, with constant deceleration parameter, is now shown to yield growing scalar density perturbations, provided thatq > 0. This study generalizes Weinberg's results for the radiation phase, and shows that any realistic model of this kind contains gravitational instabilities |
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