粒子实验可以吞噬地球

fwjmath

这么小的黑洞，一早就蒸发了~~~
bang的一声~~~

Phoenix

概率好像比爆发核战争的概率还低很多

emu

这些科学报告看来一点都不严肃，是街边小报炮制出来的吗？

Phoenix

引用 emu 在 9-22-2005 09:04 时的帖子:
这些科学报告看来一点都不严肃，是街边小报炮制出来的吗？

下面是卫报的原文：

Scientists create 'black holes' on Earth

Alok Jha, science correspondent
Friday March 18, 2005
The Guardian

Thanks to a legion of science fiction stories, black holes are easily among the most terrifying objects in the universe. It is easy to understand why: these mysterious collapsed stars suck in and destroy everything around them. Get too close and nothing in the universe could save you from their clutches.

Fortunately, real black holes only exist in the depths of space, too far from the Earth to be of much concern. But an American physicist has put forward the idea that an experiment here on Earth regularly creates objects that bear a striking resemblance to real black holes, albeit tiny ones.

Horatiu Nastase of Brown University in Providence, Rhode Island, thinks that the intense fireballs created in an atom-smashing experiment at the Brookhaven National Laboratory in New York have remarkable similarities to the celestial phenomena.

But, worry not, the fireballs are nothing dangerous - they last for a mere 100,000 billion billionths of a second and do not seem to have much impact on the matter around them.

A real black hole is made from a massive star that has collapsed on itself - the gravitational force it exerts on the space around it means that matter is drawn towards it.

Prof Nastase's work is purely theoretical. But even if it proved to be completely correct, the amount of matter involved in typical particle accelerator experiments is so small that any gravitational effects of the mini "black hole" would be inconsequential.

"A black hole that can do interesting or scary things has to be quite large," said Andrew Jaffe, a cosmologist at Imperial College.

The Relativistic Heavy Ion Collider at Brookhaven throws the nuclei of large atoms, such as gold, together at close to the speed of light. The ensuing collision creates enough heat to produce a plasma 300 million times hotter than the surface of the sun.

For the briefest of moments, the nuclei break down into their constituent bits - particles called quarks and gluons - a state of matter that has not existed since a microsecond after the big bang that began the universe.

Analysing this process usually involves some horribly complicated quantum physics. But Prof Nastase decided instead to try a different tack and use string theory.

This bizarre idea is the prime candidate to solve the biggest problem in theoretical physics: how to describe the fundamental forces of nature in a single, coherent theory.

He showed that the core of the fireball had some of the characteristics of a black hole - 10 times more particles were being absorbed by the fireball than any quantum physics calculations could predict.

He said the particles were disappearing into the fireball before coming back out again as thermal radiation, rather as real black holes suck in matter from around them and re-emit "Hawking" radiation.

The problem for string theorists has always been that their work does not have experimental data to back it up, so many physicists are sceptical. But Prof Nastase's idea could begin to turn the tide.

Whatever happens, modern physics cannot create any damaging black holes here on Earth. "A few particles that you can push together in an accelerator ain't going to hurt anybody," Dr Jaffe said.

Youth

Whatever happens, modern physics cannot create any damaging black holes here on Earth.

Phoenix

引用 Youth 在 9-23-2005 13:21 时的帖子:
Whatever happens, modern physics cannot create any damaging black holes here on Earth.

这只是其中一方观点

Youth

呵呵，是我看漏了最后一句，不过就我自己的一点了解，也是相信这个观点的

left

《科幻世界》上有个故事就是据此编的。

我个人以为，有这可能性，但似乎还得有些条件同时达到就会出现灾难性的后果。

fwjmath

引用 left 在 2005-9-24 12:05 AM 时的帖子:
《科幻世界》上有个故事就是据此编的。

我个人以为，有这可能性，但似乎还得有些条件同时达到就会出现灾难性的后果。

哪一期哪一期？我要找来看~~~

Rojer

我们的宇宙是处于亚稳定状态，或者说处于一个能量阱的底部，而阱底的能量水平高于能量“海平面”。有点像有点像放射性元素的状态。
有物理学家曾担心在做高能物理试验的时候触发某种条件，产生局部微小时空回落到能量“海平面”，进而引发连锁反应使整个宇宙回到“稳定状态”，同时释放出整个宇宙占有的能量。就像过冷水回到冰点状态一样，当然结果是我们的宇宙毁灭了…………
当学者们意识到这一种可能时确实净出了一身冷汗，所幸的是这种情况一直没有发生：），想一想宇宙中进行的一些极端物理过程是地球上永远无法模拟的，人为创造小黑洞我觉得不太可能，要把一座山的质量压缩到原子尺度，实验室中根本无法得到所需的能量。

tcogh327

你不算也不能阻止这个项目的进程
听天由命吧

白杨M

我记得科幻世界里面大刘的《朝闻道》就是有这个情节！