Cosmology · undergrad
Critical Density
The density that makes the spatial curvature term vanish for a given Hubble rate.
· 1 min
PDF View
Critical Density
The PDF file is linked, but it has not been added yet.
/sources/critical-density.pdf
Definition
The critical density is
It is the density required for a spatially flat universe in the simplest Friedmann equation.
Density Parameters
Define
The Friedmann equation can then be written as a relation among values, which is convenient for comparing matter, radiation, curvature, and dark energy contributions.
Related
Cosmology · Complete · undergrad
Complete Cosmology
A standard introductory path through expansion, Friedmann dynamics, distance scales, and the thermal history of the universe.
Cosmology · Notes · undergrad
Cosmological Constant
The constant energy density term associated with accelerated expansion.
Cosmology · Notes · undergrad
Friedmann Equations
The equations governing the expansion of a homogeneous and isotropic universe.