0
$\begingroup$

When plotting the acceleration of the scale factor according to $\Lambda$CDM, it does not show any inflationary behavior ($a'' > 0$) in early times. Does this mean the inflation is not described in $\Lambda$CDM? and we need new models beyond the general relativity so that solving the modified Friedmann equations includes inflation?

Here are the plots, according to Lambda-CDM scale factor

enter image description here

Or for early times

enter image description here

Improve this question
$\endgroup$
1

1 Answer 1

Reset to default
2
$\begingroup$

$\Lambda$CDM is a model primarily intended to describe the universe only after its earliest moments. By "after earliest moments" I mean, roughly, after the Planck era and after a rapid inflationary period if there was one. To describe the earliest moments (i.e. inflation or bounce or whatever) one might propose either a $\Lambda$CDM-like model which includes large changes in the parameters as a function of time, or one might try some other model.

Improve this answer
$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.