Wednesday, March 30, 2016

Zeno and cosmology

can you give an intuitive argument why in a FLRW-cosmology with only a cosmological constant $\Lambda$ distant objects appear at a constant angular size irrespective of their redshift?

1 comment:

  1. This is the de Sitter model, so \chi(z) = z. Since it is flat, the angular-size distance is \chi/(1+z), or z/(1+z). For z much larger than 1, this is a constant.