Comoving and physical momentum in a Friedmann universe
Posted by Photon, at physics.stackexchange.com,
It is most probably a very basic question, but I'm a bit stuck with it. Let us consider a spatially flat Friedmann universe…
It is most probably a very basic question, but I'm a bit stuck with it. Let us consider a spatially flat Friedmann universe…
I'm trying to follow the calculations in http://arxiv.org/abs/hep-th/0201158v2 The aim is to rederive the expressions (2.16), (2.