End Times

Further to recent post about religious eschatology, I see that Nature has a review of a book by an astrophysicist discussing the possible ways the universe could end:   Big Crunch, Heat Death, Big Rip, or perhaps the most disconcerting one because it could presumably happen at any time, vacuum decay.  

The review notes this:

The latest measurements point to a Heat Death, but a Big Crunch or Big Rip are within their uncertainties.

Yeah, I thought that was still the case, but seems to be underappreciated in pop science writing - a reversal into a Big Crunch, which at least has that satisfying feeling of a dramatic climax (as well as possibly satisfying Hindu and Buddhist belief in a cyclic universe, not to mention a possible Tiplerian Omega Point), is not yet completely written off.   

As for vacuum decay:

The final doomsday scenario that Mack describes is extremely unlikely: vacuum decay. A tiny bubble of ‘true vacuum’ could form, owing to instability in the field associated with the Higgs boson. That might happen if, say, a black hole evaporates in just the wrong way. Such a bubble would expand at the speed of light, destroying everything, until it cancels the universe. Vacuum decay might already have begun in some distant place. We won’t see it coming.

The possibility of vacuum decay happening as a result of the experiments at the Large Hadron Collider was one reason to fret about the wisdom of operating it, as I used to note in posts which are still on the blog.   Fortunately, it would seem that the universe is not constructed in such a way that the LHC could cause much damage.