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Considering that space-time is expanding at an increasing rate or perhaps during times of inflation - could a black hole just above the neutron star threshold experience a decrease in density to switch back to a neutron star?

Edit: That is, same mass/energy as before but it's now contained in a volume greater than the Schwarzschild radius due to expansion (current or future or inflation era) in the fabric of space time itself.

PS: I'm not talking about that process by energy or mass escaping it (as discussed here).

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No. According to accepted theory, a black hole generally can't lose energy or mass. Even with Hawking radiation, the black hole would simply change size accordingly and remain a black hole. Once it got too small it would evaporate into a burst of Hawking radiation.

I know you say you aren't talking about energy or mass escaping the black hole, but the idea of black holes is that they are a one-way process.

I fail to see how the linked article isn't an answer to your question.

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  • $\begingroup$ same mass/energy but now contained in volume exceeding Schwarzschild radius due to space-time expansion $\endgroup$
    – DeepSpace101
    Commented Feb 8, 2017 at 18:31
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Spacetime does not expand at scales comparable to a Schwarzchild radius, or a solar system, or even a galaxy. Not trying to be a smarty-pants, but for the benefit of all, please get the basics under wraps before moving into conjecture.

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    $\begingroup$ For the benefit of all, can you be more specific about the rate mismatch? Expansion rates from the past. present or future predicted? $\endgroup$
    – DeepSpace101
    Commented Feb 8, 2017 at 18:53
  • $\begingroup$ en.wikipedia.org/wiki/Metric_expansion_of_space $\endgroup$
    – LegitimateWorkUser
    Commented Feb 8, 2017 at 19:04
  • $\begingroup$ Thanks. Are you able to construct a cohesive answer? $\endgroup$
    – DeepSpace101
    Commented Feb 8, 2017 at 19:06
  • $\begingroup$ The answer seems to contradict the big rip en.wikipedia.org/wiki/Big_Rip $\endgroup$
    – user126422
    Commented Feb 9, 2017 at 5:03

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