Tag Archive for: Friedmann equations

electric potential

Deriving the Cosmic Fluid Equation from Energy Conservation

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Local energy conservation in general relativity (GR), expressed as ##{T^{0b}}_{;b}=0##, combines with the Friedmann-Lemaître-Robertson-Walker (FLRW) metric…
cosmo

Approximate LCDM Expansion in Simplified Math

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 If we restrict ourselves to a spatially flat LCDM universe model (and ignore the early radiation energy density), the first Friedmann equation…