Can a BH be destroyed?

Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the lab.
Let's say with a magnetic field of some sort. After experimenting they want
to shut it all down for the night. Can they? Or is the BH forever?

BV.

"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the lab.
Let's say with a magnetic field of some sort. After experimenting they want
to shut it all down for the night. Can they? Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.

"Greg Neill" wrote in
:

"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in
the lab. Let's say with a magnetic field of some sort. After
experimenting they want to shut it all down for the night. Can they?
Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


That is a prediction of Hawkings theory but there is no empirical
observation of this effect as far as I am aware.

LK.

"Llanzlan Klazmon The 15th" wrote in message
7.6...
"Greg Neill" wrote in
:

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


That is a prediction of Hawkings theory but there is no empirical
observation of this effect as far as I am aware.

Not only Hawking's theories -- It's a generally
understood theoretical result.

But as you say, there are no empirical observations.
Actually, there are no empirical observations of
any (close up) black holes.

In message , Greg Neill
writes
"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the lab.
Let's say with a magnetic field of some sort. After experimenting they want
to shut it all down for the night. Can they? Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

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"Jonathan Silverlight" wrote
in message ...
In message , Greg Neill
writes
"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the
lab.
Let's say with a magnetic field of some sort. After experimenting they
want
to shut it all down for the night. Can they? Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

LOL. That is the very story that began the thread in my brain. What if...a
lab created one...what would they do with it when they were done?

BV.

Didn't David Brin write a story liek this where scientists lose the black
hole which then starts running back and forth inside the earth's core eating
away at it?

"Jonathan Silverlight" wrote
in message ...
In message , Greg Neill
writes
"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the
lab.
Let's say with a magnetic field of some sort. After experimenting they
want
to shut it all down for the night. Can they? Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

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In message , Scott Schwartz
writes

"Jonathan Silverlight" wrote
in message ...
In message , Greg Neill
writes
"BenignVanilla" wrote in message
...
Hypothetically...

In a lab, some physicists create a small BH suppended in mid air in the
lab.
Let's say with a magnetic field of some sort. After experimenting they
want
to shut it all down for the night. Can they? Or is the BH forever?

For a small black hole they'd have a great deal
of trouble trying to keep it around -- black
hole temperatures (and thus evaporation rates)
are inversely proportional to mass. The tiny
ones go BOOM! in short order.


Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

Didn't David Brin write a story liek this where scientists lose the black
hole which then starts running back and forth inside the earth's core eating
away at it?

Yes - "Earth". Brin's story uses the new physics of evaporating black
holes, and it's a made thing, while the BH in Niven's story is a
primordial object left over from the big bang.
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In message , BenignVanilla
writes

"Jonathan Silverlight" wrote
in message ...

Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

LOL. That is the very story that began the thread in my brain. What if...a
lab created one...what would they do with it when they were done?

In the Niven story it's a communication device, sending gravitational
waves. It would also make a nice weapon, like the Death Star.
Alternatively, if you could show that firing one at the Earth
_wouldn't_ blow it up it would make a superb seismic probe - wasn't
there a suggestion that a string of earthquakes was produced by a nugget
of "strange matter"?
Evaporating black holes would make good energy sources. In "Imperial
Earth" Arthur Clarke uses something similar as the power plant for a
spaceship.
I'd better stop and let someone else post ideas :-)
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Back before people thought this, Larry Niven wrote a short story (The
Hole Man) in which explorers find just such a black hole left by aliens
on Mars. They shut it down by accident, and the thing drops into the
centre of Mars and starts eating it.

Talk about dumping toxic waste!

Clear Skies

Chuck Taylor
Do you observe the moon?
Try the Lunar Observing Group
http://groups.yahoo.com/group/lunar-observing/
Lunar Picture of the Day http://www.lpod.org/
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