There's also an anthropic estimation of the time constant for annihilation events. It's 13.8 billion years. Brent On 8/3/2015 6:36 PM, James Propp wrote:

Isn't there an anthropic principle explanation here? To wit: the reason our universe hasn't been annihilated yet is that if it had, we wouldn't be around to ask why it hadn't.

This is not a comforting option, if one considers its implications for what's likely to happen a second from now. And, if we live so long, a second after that. And a second after that. Etc.

Jim Propp

On Monday, August 3, 2015, Henry Baker <hbaker1@pipeline.com> wrote:

...

FYI --

Tiny black holes could trigger collapse of universe­-except that they don't

http://news.sciencemag.org/europe/2015/08/tiny-black-holes-could-trigger-col...

http://arxiv.org/abs/1501.04937

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