## Tuesday, 11 May 2021

### Cosmic distance measures

I am still trying to prove the relationships between different cosmic distance measures$$d_L=\left(1+z\right)d_M=\left(1+z\right)^2d_A$$and I'm sill not there. on the way I came across a nice graph on Wikipedia comparing them for various $z$ and wondered if I could reproduce it. My version and the Wikipedia one are shown below, I was pleased.
 Spot the difference

Here's how and my first attempts at proving that formula: Commentary 8.5.4 More distances.pdf (10 pages)