Stability of cosmological models

[axlsaml1]

to those experts in the field of cosmology

i was wondering if " large scale structures can be formed in stable cosmological models"

or should i say that " large scale structures cannot be formed in those cosmological models that are stable with respect to gravitational or other curvature perturbations like the Einstein static universe model "

 

[Wallace]

Hmm, this sounds like a homework question.

What are your thoughts on this? Generally homework help is given only if the genuine attempts made have been shown in the post. There is also a specific homework help forum, although for cosmology you might get better results here, but you still need to show your work on the question first!

Welcome to PF!

 

[axlsaml1]

hint : Wanas and Bakry in a paper entitled " stability of cosmological models"


say : that large scale structures cannot be formed in stable cosmological models.

i just don't agree and i say that their argument is not accurate enough . i think they shoul rather say :

that " large scale structures cannot be formed in those cosmological models that are stable with respect to gravitational or other curvature perturbations like the Einstein static universe model "

who's wrong ?
I or them?

 

[Wallace]

But why do you disagree? What is wrong about what they say?