Re: [轉錄][新聞]大型強子對撞器，倒數 25 天。

[yduj (祈求天下無災歲歲年年)]

: 。
: =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
: 怪恐怖的，天知道會撞出什麼東西(黑洞、大爆炸之類的)。 雖然有一點危言聳聽，可是
: 還是會對未知的事物感到害怕阿。(抖....)


   http://physicsworld.com/cws/article/news/34711

A report from the CERN laboratory near Geneva has restated the conclusion
that the Large Hadron Collider (LHC) — the biggest experiment in particle
physics — poses “no danger” to humankind. CERN hopes the report will
dispel public fears that the accelerator will produce black holes or
hypothetical particles known as strangelets that could destroy the Earth.

If all goes to plan, CERN expect to inject the first proton beams into the
LHC in August. These beams will collide at energies close to 14 TeV — enough
to generate a hoard of new particles and possibly even the highly anticipated
Higgs boson. However, amid all the excitement about the discovery of new
physics, some of the public have worried that particle collisions at the LHC
might create other, more sinister entities. Recently Walter Wagner, a trained
nuclear physicist, and colleague Luis Sancho filed a lawsuit in Hawaii to
prevent the LHC from starting up based on these worries.

In 2003 CERN’s LHC safety study group produced a report that concluded that
there is “no basis for any conceivable threat” of either dangerous black
holes or strangelets. The new report — written by the LHC safety assessment
group (LSAG) including John Ellis, Gian Giudice, Michelangelo Mangano, Igor
Tkachev and Urs Wiedemann of CERN — has come to exactly the same, though “
reinforced”, conclusion.

“With this report, the laboratory has fulfilled every safety and
environmental evaluation necessary to ensure safe operation of this exciting
new research facility,” said Robert Aymar, director-general of CERN, in a
statement.

No danger
The LSAG report draws attention to the fact that cosmic rays collide
continually with the Earth and other astronomical bodies at much higher
energies than the LHC, yet do not appear to create either large black holes
or strangelets. “We estimate that the universe is replicating the total
number of collisions to be made by the LHC over 1013 times per second, and
has already done so some 1031 times since the origin of the universe,” the
report states.

With regards to black holes, the report maintains that “if they can be
produced in the collisions of elementary particles, they must also be able to
decay back into them.” If the black holes do not immediately decay, however,
“they would be unable to accrete matter in a manner dangerous for the Earth.
”

The report compares the likelihood of strangelets being produced at the LHC
with the likelihood of them being produced at the Relativistic Heavy Ion
Collider (RHIC), which came online at the Brookhaven National Laboratory, US,
in 2000. Given experimental measurements taken at the RHIC, the report claims
that “in the event they exist, strangelets would be less likely to be
produced at the LHC than at [the] RHIC.”




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推 serveto:被Higgs boson打到會不會變超級賽亞人？能量足以毀滅星球
→ Naturalist:不會只會變成浩克 還不能毀滅星球~
推 serveto:想到撕裂地平線....太空船到了未知的領域過
→ serveto:撞擊後如果跑出像那部電影裡頭的東西來就好玩了XD
推 kilva:即使撞出了異世界，也不一定撞得出異世界中的智慧生物來。
→ kilva:能撞出微型黑洞就很了不起了。
推 serveto:如果像科幻驚悚電影，撞擊後有某種黑暗能量「感染」在場
→ serveto:科學家，然後這些被強殖入侵的人又神不知鬼不覺在地球上
→ xhole:撞擊完後 有一個惜字如金的MIT科學家跟一把鐵撬開始了旅程
推 zealeliot:大家的想法都很有趣
→ serveto:有機會大家接力寫個科幻小說:P
推 ww:會不會撞了 什麼都沒發生 100億美金倒是燒掉了
推 AppleFox:所以說粒子要加速兩個月對撞嗎?