Postulates with no evidence

There are well-known physicists/cosmologists who are widely published in peer-reviewed journals, and who publish articles which contain postulates which are nonverifiable. It appears to me that that goes against forum policy rules.

My question is this: How are we to handle such theories which contain such postulates? If we read such articles and want to discuss them here is it cosidered speculation an has to remain in this forum or if its peer reviewed can we discuss it in the physics forums.

I'm refering to physicists such as Alan H. Guth and Paul Davies. See

Alan H. Guth et al - http://arxiv.org/abs/0808.3778 -- Journal Reference - (not sure -please see ref)

Paul Davies - http://arxiv.org/abs/astro-ph/0403047 -- Journal Reference - Mod.Phys.Lett.A19:727-744,2004