Introduction to Cosmology Ryden · Problem 4.3

Cosmic Dynamics

Physics — Astrophysics · einstein-static-universe-curvature

Problem

\rho = 2.7 \times 10^{-27}

kg m

^{-3}

, what is the radius of curvature

R_0

of Einstein's static universe? How long would it take a photon to circumnavigate such a universe?