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Date: 30 Apr 2007 00:42:32
From:
Subject: Limitless black holes?
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Hello,
I was reading the Scientific American Reports magazine on black
holes.
In the article 'QUANTUM black holes' Mr. Carr and Giddings write,
based on Hawking's findings, that Quantum black holes are not stable
and hence will decay (hence not destroying by swallowing the Earth).
However, it made me wonder whether there is a similar upper limit on
the stability of black holes or if they can grow with the limit being
the entire Universe. Has anyone read or know any good resources to
find out? I am in Iraq and can't go to the local bookstore or library
to find out.
I also wondered if black holes (and massive black holes at the center
of galaxies) due to their size and nature are a one way into another
parallel dimension. We know that wormholes can be used as time
machines (provided the right circumstances and that they can actually
be stable) but due to their nature it is impossible to know what
happens to the matter that crosses the event horizon of a black hole.
The assumption is that the black hole simply gains mass and hence
grows in size and strength. That is what we as the viewers see from
our perspective, however since they appear as frozen in time to us due
to how the bend time and space that is only our perception. I'm not
taking about some science fiction black hole but on perhaps they are
part of the continuing cycle of the Universe.
Hawking proposed that the Universe is stuck in a loop and that the
Universe will reach a point at which the Universe will simply rewind
(a bad anology in our time) to the Big Bang and all of it will start
again. Perhaps the black holes are the engine that runs this process
by which they are continually feeding the matter they capture to the
beginning of time or before space time began.
Thank you!
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Date: 01 May 2007 08:37:15
From: Sam Wormley
Subject: Re: Limitless black holes?
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medina4me@netscape.net wrote:
>
> I was reading the Scientific American Reports magazine on black
> holes. In the article 'QUANTUM black holes' Mr. Carr and Giddings write,
> based on Hawking's findings, that Quantum black holes are not stable
> and hence will decay (hence not destroying by swallowing the Earth).
>
> However, it made me wonder whether there is a similar upper limit on
> the stability of black holes or if they can grow with the limit being
> the entire Universe.
Black Holes can grow as long as there is something to feed them.
The accelerated expansion of the universe will essentially limit
black hole growth as galaxies recede from each other.
Black Holes
http://scienceworld.wolfram.com/physics/topics/BlackHoles.html
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Date: 30 Apr 2007 12:59:29
From: Sam Wormley
Subject: Re: Limitless black holes?
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medina4me@netscape.net wrote:
>
> I was reading the Scientific American Reports magazine on black
> holes. In the article 'QUANTUM black holes' Mr. Carr and Giddings write,
> based on Hawking's findings, that Quantum black holes are not stable
> and hence will decay (hence not destroying by swallowing the Earth).
>
In addition to Greg Neill's comments, see "Monster of the Milky Way"
http://www.pbs.org/wgbh/nova/blackhole/program.html
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Date: 30 Apr 2007 06:31:01
From: Greg Neill
Subject: Re: Limitless black holes?
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<medina4me@netscape.net > wrote in message
news:1177918952.651548.39740@u30g2000hsc.googlegroups.com...
> Hello,
>
> I was reading the Scientific American Reports magazine on black
> holes.
> In the article 'QUANTUM black holes' Mr. Carr and Giddings write,
> based on Hawking's findings, that Quantum black holes are not stable
> and hence will decay (hence not destroying by swallowing the Earth).
>
> However, it made me wonder whether there is a similar upper limit on
> the stability of black holes or if they can grow with the limit being
> the entire Universe. Has anyone read or know any good resources to
> find out? I am in Iraq and can't go to the local bookstore or library
> to find out.
There does not appear to be any upper limit to the
mass that a black hole can achieve other than the
availability of matter to feed it. Black holes
gravitate, they don't "suck", so it's possible for
a black hole to "starve" in a stable system.
>
> I also wondered if black holes (and massive black holes at the center
> of galaxies) due to their size and nature are a one way into another
> parallel dimension.
Pure speculation at this point.
> We know that wormholes can be used as time
> machines (provided the right circumstances and that they can actually
> be stable)
...and if we postulate the existance of certain exotic
matter...
> but due to their nature it is impossible to know what
> happens to the matter that crosses the event horizon of a black hole.
> The assumption is that the black hole simply gains mass and hence
> grows in size and strength. That is what we as the viewers see from
> our perspective, however since they appear as frozen in time to us due
> to how the bend time and space that is only our perception. I'm not
> taking about some science fiction black hole but on perhaps they are
> part of the continuing cycle of the Universe.
Theory tells us that matter that falls below an event
horizon must fall to a central singularity, being shredded
("spaghettified") en route. It makes the trip in finite
proper time.
>
> Hawking proposed that the Universe is stuck in a loop and that the
> Universe will reach a point at which the Universe will simply rewind
> (a bad anology in our time) to the Big Bang and all of it will start
> again. Perhaps the black holes are the engine that runs this process
> by which they are continually feeding the matter they capture to the
> beginning of time or before space time began.
Sort of like cosmic plumbing and drains, eh?
Well, without empirical data or even theory as constraints
on the imagination anything is possible, but nothing is
probable!
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