Whatever happened to the Dyer-Roeder distance?

Phillip Helbig

The Observatory, 140, 1277, 128–144 (August 2020)


The Universe is not completely homogeneous. Even if it is sufficiently so on large scales, it is very inhomogeneous at small scales, and this has an effect on light propagation, so that the distance as a function of redshift, which in many cases is defined via light propagation, can differ from the homogeneous case. Simple models can take this into account. One such model is known as the Dyer–Roeder distance. I sketch the history of this model and some applications, then suggest some reasons why it is still relatively obscure.


info and local links to full paper | ADS: 2020OBS...140..128H | Google Scholar
directory of Phillip Helbig's abstracts
Phillip Helbig's publications
Phillip Helbig's research
Phillip Helbig's home page
last modified on Saturday, April 24, 2021 at 09:35:28 PM by helbig@ascameltro.multivax.de (remove animal to reply)