The problem in inflationary
universe theory with a decaying and subsequently ending of inflation is that it contradicts big-bang itself. On the contrary, the increasing pace of expanding universe as has been observed seems more logical.
If big bang was the start, then
in such case, even if transitory, it had to have an equilibrium or stable
state. Because if it was not a stable state, then it is not the start, it is a
intermediate state and there has to be something, before that. Now in case we assume big bang as
the starting point, we are then claiming that there was an stable (equilibrium) state before big bang, which was violated, thereby causing big
bang. In such case there is no reason inflation will ever stop as there is
nothing that is creating the equilibrium that will cease inflation. Increase in
the gravitation field (universe), indeed is the decay process.
There is no reason that this
decay will ever stop, because as you rightly said gravity has no bottom – that is
gravity is not quantum object.
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