the "ad hoc" is because of the introduction of the inflatons which do 
nothing but, um, inflate...

Stephen said:
b) some sound explanation where given as
> to how an in principle unknowable phenomenon - the BB singularity itself - 
> is any different from a Creative Deity, sans only the anthropomorphisms.


It seems that Steinhardt's model also attempts to solve the problem, at 
least according to wikipedia:

The ekpyrotic and cyclic models are also considered competitors to 
inflation. These models solve the horizon problem through an expanding 
epoch well before the Big Bang, and then generate the required spectrum 
of primordial density perturbations during a contracting phase leading 
to a Big Crunch. The universe passes through the Big Crunch and emerges 
in a hot Big Bang phase. In this sense they are reminiscent of the 
oscillatory universe proposed by Richard Chace Tolman: however in 
Tolman's model the total age of the universe is necessarily finite, 
while in these models this is not necessarily so. Whether the correct 
spectrum of density fluctuations can be produced, and whether the 
universe can successfully navigate the Big Bang/Big Crunch transition, 
remains a topic of controversy and current research.

But, as I've said, I haven't read any of the papers, so I dunno.

Also, I'm not quite sure what to think of this whole Big Bang when 
adopting COMP - have to think about it yet...


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