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Forums
Physics
Special and General Relativity
Cosmological Density Perturbation vs Homogeneity: Questions Answered
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[QUOTE="victorvmotti, post: 6846958, member: 492233"] Also, answered by ChatGPT, fairly accurate! The standard model of cosmology, known as the Lambda-CDM model, assumes that the universe is homogeneous and isotropic on large scales, and that the universe is undergoing a period of accelerated expansion. This model is supported by a wide range of observational data, including the cosmic microwave background radiation, large-scale structure, and the observed abundances of light elements. In the early universe, density perturbations did exist, but these were small and smooth, leading to the formation of galaxies and other structures we observe today. The density perturbations do not contradict the overall homogeneity of the universe, but rather represent small deviations from it. The standard model of cosmology is considered to be valid from the time of the last scattering surface (when the cosmic microwave background radiation was emitted) up until the present day. Beyond this, the validity of the standard model is currently uncertain, and there may be other factors at play that we do not yet fully understand. The scale factor of the expanding universe is considered to be a good approximation for this time range. [/QUOTE]
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Physics
Special and General Relativity
Cosmological Density Perturbation vs Homogeneity: Questions Answered
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