-Caveat Lector-   <A HREF="http://www.ctrl.org/">
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from:
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Click Here: <A HREF="http://www.aci.net/kalliste/">The Home Page of J. Orlin
Grabbe</A>
-----
Physics Experiments


The End of the World May Arrive on Long Island


The New York senate race may be less important than commonly believed.

When the Relativistic Heavy Ion Collider begins operating in May, it will
recreate conditions that have not existed since the dawn of the universe.

Could that mean the end of the world?

Last year a British newspaper charged that the new physics experiment on Long
Island might somehow generate a black hole that would swallow the planet, or
perhaps turn all of creation into some kind of deadly "strange matter."

Given that the collider will hurl particles into one another almost at the
speed of light, generating temperatures of a trillion degrees and creating a
substance that has not existed for 13 billion years, it is easy to imagine
that it might cause some kind of catastrophe.

But a panel of physicists commissioned by the Brookhaven National Laboratory
after the article came out in The Sunday Times of London has determined that
every imaginable disaster scenario would be impossible � or at least
extremely unlikely.

"Our conclusion is that the candidate mechanisms for catastrophe scenarios at
RHIC are firmly excluded by existing empirical evidence, compelling
theoretical arguments, or both," the panel wrote in their report to
Brookhaven director John Marburger.

The black hole idea was easy to dismiss. Although the RHIC collisions will
pack an awful lot of energy into a very small space, their total impact is
roughly equivalent to a mosquito hitting a screen door. Hardly enough to make
a black hole.

Another scenario was at least theoretically possible. Maybe a collision could
create strangelets, a new form of matter that would also transform everything
in contact with it � at the speed of light.

"This one you can't absolutely say no to," said Brookhaven physicist Tim
Hallman.

But in order for RHIC to create world-destroying strangelets, a whole chain
of things that physicists consider impossible would have to happen.

First, strangelets would have to be produced at an unbelievably low energy
for RHIC to be able to generate them.

Second, they would have to be much more stable than physicists think they are
in order to exist long enough to do any damage.

Third, they would have to be negatively charged � in violation of current
theory. A positively charged strangelet would immediately be isolated from
the rest of the universe by a swarm of negatively charged electrons � and do
no harm to anybody.

There's one more disaster scenario. Somehow the massive energy released at
RHIC could jar the universe into a lower vacuum energy state.

The vacuum state is sort of the energy level of empty space. It is possible,
but unlikely, that the universe is not in the lowest possible vacuum energy
state and that RHIC could jostle it to a less energetic level.

"This would trigger a chain reaction which would literally swallow up the
whole universe at the speed of light," said Brookhaven physicist Tom Ludlam.

But if that were possible at RHIC, it would have happened already somewhere
else. Powerful cosmic rays, generated in deep space by exploding stars and
other extremely violent sources, have been smashing into the moon and other
celestial objects with at least as much energy as the RHIC collisions for
billions of years. So the physics panel concluded that if a resetting of the
universe's energy were possible at RHIC, it would have happened somewhere
else by now.

In the end, that argument really applies to all the potential RHIC disaster
scenarios. Mother Nature has been creating particle collisions more powerful
than RHIC's for eons. It's just that until very recently, compared to the age
of the universe, people haven't been around to worry about them.

Physicists say the collider will begin operating some time in May, depending
on how long it takes to power up the superconducting magnets and fill the
machine with gold nuclei. It typically takes months to get a high-energy
particle collider operating.
Fox News, March 27, 2000

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