I am an ignoramus on this subject, and I assume that these statements quoted from wikipedia are more or less accurate:(http://en.wikipedia.org/wiki/Inflaton)

1) Prior to the expansion period, the inflaton field was at a higher-energy state.

2) Random quantum fluctuations triggered a phase transition whereby the inflaton field released its potential energy as matter and radiation as it settled to its lowest-energy state.

So, in the "classical/standard" theory (that means, no string theories, or newer ones), what was assumed to prevent the highly dense universe to become a black hole before inflation started?

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    $\begingroup$ @JohnRennie thanks, could you correct the link? it gous back to this same question $\endgroup$
    – user65081
    Oct 19 '14 at 17:25
  • $\begingroup$ Oops, drat! Try this link. $\endgroup$ Oct 19 '14 at 17:36
  • $\begingroup$ I wonder if it's worth writing another blog type question and answer on this topic ... $\endgroup$ Oct 19 '14 at 17:38
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    $\begingroup$ My comments to that question address the classical GR theory not LQG. $\endgroup$ Oct 19 '14 at 17:39
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    $\begingroup$ Local density fluctuations are required but not sufficient to form black holes. A black hole can only form/grow if the matter falling towards the local barycenter can also shed enough angular momentum and energy to actually reach the event horizon. The heating and fast rotation of large gravitating masses sets limits to how fast black holes can grow. If anything, theorists are scrambling for ideas, right now, how to get around the naive limits that follow from conservation laws. $\endgroup$
    – CuriousOne
    Oct 19 '14 at 19:40