Stability of cosmological models

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Discussion Overview

The discussion revolves around the formation of large scale structures in cosmological models, specifically questioning whether such structures can exist in models deemed stable with respect to gravitational or curvature perturbations. The conversation touches on theoretical implications and interpretations of existing literature in cosmology.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant questions if large scale structures can be formed in stable cosmological models, referencing the Einstein static universe model.
  • Another participant suggests that homework help is typically provided when genuine attempts are shown, indicating a potential misunderstanding of the question's context.
  • A third participant cites a paper by Wanas and Bakry, which claims that large scale structures cannot form in stable cosmological models, but expresses disagreement with this conclusion, suggesting a more nuanced interpretation.
  • Further inquiry is made into the reasons behind the disagreement with the cited paper's argument.

Areas of Agreement / Disagreement

Participants express differing views on the claims made by Wanas and Bakry regarding the formation of large scale structures in stable cosmological models, indicating that the discussion remains unresolved.

Contextual Notes

There are limitations in the discussion regarding the definitions of stability and large scale structures, as well as the specific conditions under which these claims are made, which remain unresolved.

axlsaml1
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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 "
 
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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!
 
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?
 
But why do you disagree? What is wrong about what they say?
 

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