9
Friedman World
Models
•Einstein’s Field Equations
–Under ideas discussed previously (cosmological principle, Weyl’s postulate, isotropy,
homogeneity) the field
equations reduce to the simple pair of independent equations:
–R is the scale factor, ρ is total inertial mass density of matter & radiation, p the
associated pressure. Script R is the radius of curvature, and
there’s lambda.
