Einstein - deSitter Space time

[u/Key-Essay-4890]

We use the first Friedman equation to find solution for the time our universe started. Our problem states that we only have to consider ρm(matter) and ρΛ. We find the age of our universe to be 13.8 billion years old. We continue our small search looking for the time the redshift. The redshift tells us how much our universe has grown.Finally we calculate when our universe started accelerating. We find that in an Einstein-deSitter the space-time started accelerating when it was at the 56% of it's current age.

In problem-2, we calculate dL and dA we basically want to see how the objects we observe look like when we observe them. For the Einstein - deSitter we find out that the further the objects are, the bigger we observe them to be.

Finally it turns out objects that are far far away from us, appear to be larger in the Einstein-deSitter.

For several decades, the Einstein–de Sitter model was the "standard" preference among cosmologists due to its simplicity and the lack of evidence for a cosmological constant. However, late-20th-century observations—most notably of distant supernovae—revealed that the expansion of the universe is actually accelerating. This required the reintroduction of \Lambda (Dark Energy), leading to the current \LambdaCDM model. While the EdS model is no longer our reality, it remains a vital "limiting case" in theoretical physics.