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Results tagged with observable-universe
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user 105620
The observable universe of a given observer encompasses the volume of space from which information - particles, radiation - could ever (past, present or future) reach that observer.
21
votes
Ambiguity in applying Newton's shell theorem in an infinite homogeneous universe
The problem lies in the boundary conditions. Ignoring factors of $G$ and $\pi$, gauss's law of gravitation relates the gravitational potential $\Phi$ to the mass density $\rho$ by
$$\rho=-\nabla^2 \Ph …
- 1,113