Progressing wave perturbations of cosmological spacetimes
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We determine the large class of Robertson-Walker spacetimes whose first-order, linear, isentropic perturbations can be expressed in closed form, and the closed form perturbations are written down. It is shown that the class includes several well-known spacetimes including, for example, spatially flat dust and the radiation filled universe.
KeywordsRadiation Dust Closed Form Large Class Differential Geometry
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