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- W2007263537 abstract "We obtain exact analytical solutions for the spherically symmetric perturbations of Friedmann models by assuming, at the zero-order level, a linear equation of state (flat models) and a dust or radiation content (open and closed models). We study the propagation of cosmic background radiation in these models and obtain the strong upper limits $|{u}_{0}^{r}|ensuremath{lesssim}520$ km ${mathrm{sec}}^{ensuremath{-}1}$ for our radial velocity with respect to the center and ${(frac{ensuremath{sigma}}{ensuremath{theta}})}_{0}={(frac{E}{ensuremath{rho}})}_{0}ensuremath{lesssim}4ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}8}$ for the present relative distortion and gravitational energy (this last in the case of a flat model, assuming the center is outside our horizon and an equation of state $p=0$ up to the perturbation level). The two upper limits are obtained under the assumption that the present anisotropy parameter is bounded by ${(frac{ensuremath{Delta}T}{T})}_{0}ensuremath{lesssim}{10}^{ensuremath{-}3}$. However, when we are near the center no limits can be found on the relevant physical quantities, thus supporting the view that we can have non-Friedmannian metrics which do not conflict with observations on anisotropies, as has been suggested in the literature." @default.
- W2007263537 created "2016-06-24" @default.
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- W2007263537 date "1984-02-15" @default.
- W2007263537 modified "2023-09-25" @default.
- W2007263537 title "Evolution of spherically symmetric perturbations of Friedmann models and the propagation of cosmic background radiation" @default.
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- W2007263537 doi "https://doi.org/10.1103/physrevd.29.607" @default.
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