CQW is an educational resource for theoretical physics and astrophysics, field theory, relativity and cosmology. we post a new question every wednesday for students to get and for teachers to stay in shape.
Friday, January 6, 2012
in cosmology we can measure the Hubble function $H(a)$ and the growth
function $D_+(a)$. do they carry the same information? could one compute
$D_+$ with the knowledge of only $H$ and vice versa? are there cosmologies
where this is NOT possible?