- #1
June_cosmo
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Homework Statement
Assume the cosmological model with H0=72,Omega_M=1-Omega_lamda=0.3,(so dark energy with w = − 1) and a flat universe.)
a) Find the redshift z at which the universe starts accelerating (that is, when it transitions from decelerating to accelerating).
b) How long ago did this happen?
Homework Equations
The Attempt at a Solution
I don't quite understand the accelerating here. Does it mean that the expanding rate begins to accelerate? How should I start this problem?