On 1/24/2014 3:12 PM, LizR wrote:
On 25 January 2014 11:59, meekerdb <[email protected] <mailto:[email protected]>>
wrote:
A warp in space that is bound together by its own gravitation is what is
known as a
black hole.
Technically I believe there is still a mass inside it,
No, it's massive, i.e. it warps space around it, but I don't think it makes sense to say
it has a mass inside it; it's a solution to Einstein's equation without any T_u_v, i.e. a
vacuum.
however, even if it has been crushed to a point. It isn't a "free-floating space warp"
which is what Edgar was suggesting (I asked him, to double check, and he affirmed it).
If that was possible, then presumably /any/ space warp could become detached from its
source
A black hole crushes it's source into a singularity (in the classical
approximation).
and "drift off into the aether" ... the Earth might leave a furrow in space behind it as
it orbits the Sun, into which dust and asteroids would tumble...
There /are/ "free-floating space warps", of course, namely gravity waves. But as far as
I know, they don't appear to be a major contributor to "dark matter".
Gravity waves can't exactly be 'free floating' because they travel at the speed of light
and only interact gravitationally. So unless they are strong enough to close up on
themselves and make a black hole, they will radiate off to infinity.
Brent
Note that Hawking as just posted a paper casting doubt on their existence:
http://arxiv.org/abs/1401.5761
I will read that with interest, thank you! I have long suspected that black holes don't
exist as specified in GR - I mean, that they aren't infinitely dense singularities
inside an event horizon. Nice to see Stephen coming round to my way of thinking :-)
No, seriously, a lot of alternatives to Black Holes have been suggested, and some even
seem quite likely to my poor little brain. Presumably GR breaks down at some point
before it reaches infinity (otherwise all your "finitist numerologists" are in trouble :-)
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