Re: Black Holes in the Big Rip

On 24 Sep, 19:20, OwlHoot <ravensd...@xxxxxxxxxxxxxx> wrote:
If the expansion of the Universe is accelerating, as recent
observations indicate, and this continues, then eventually
space will be expanding at faster than light speed in a
vacuum (the so-called "Big Rip").

Presumably in that case, event horizons of black holes would
start shrinking, and I would be interested to know whether
any work has been done by black hole cosmologists on these
extreme conditions.

In particular, what would the effective temperature be at
the event horizon? (Zero one might naively think, as the
exterior would be in effect a perfect heat sink.)

Also, is it possible or likely that features inside black
holes, such as mass-inflated horizons, would be uncovered
in their futures and perhaps even locally counteract the
expansion, or does GR prohibit local variations in the
cosmological "constant" (even if it is changing overall)?

Any insights and informed and/or idle speculation welcome!

Isn't a wormhole essentially a black hole with negative mass
stabalizing it? Could a black hole become a wormhole?

Another perhaps silly question. The "rip" seems to me to have a
certain symmetry about it. If we ripped a quark apart would we have
Inflation and a new Universe. Just a thought.

Good SF story. Plunging though a black hole in a dying Universe.

-Ian Parker

.

Relevant Pages

  • Re: No more black holes? (To appear in Phys Rev D)
    ... local event horizons to classify and divide Hilbert space ... Hawking radiation not cause any primordial black hole ... classical solution sourced by a spherical domain wall. ... Perhaps third quantization could ...
    (sci.physics.relativity)
  • Re: No more black holes? (To appear in Phys Rev D)
    ... Won't the black hole evaporate before ... especially when the black hole gets very small-- is unclear. ... My problem here is the presumption that event horizons exist. ... contradictory belief that the past is finite and that event ...
    (sci.physics.relativity)
  • distorted event horizons and temperature of black holes
    ... Black hole event horizons are circular in shape, ... both holes must distort away from circular.Indeed the closer the holes ... hole has no gravity and therefore no mass -clearly ridiculous!). ...
    (sci.physics.research)
  • Re: No more black holes? (To appear in Phys Rev D)
    ... Won't the black hole evaporate before ... but then quickly contradicts himself: ... especially when the black hole gets very small-- is unclear. ... My problem here is the presumption that event horizons exist. ...
    (sci.physics.relativity)
  • Re: diameter of a wormhole
    ... i thought that a wormhole is stronger than ... a black hole because she needs much more energy ... Finite input, with finite output. ... The problem is that the medium that emitted the CMBR had a calculable ...
    (sci.physics.relativity)