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Comment: Re:Isn't this (Score 1) 164

by Pro-feet (#44828283) Attached to: Black Holes Grow By Eating Quantum Foam

The LHC is basically working at the same energies equal to cosmic rays striking the earth's atmosphere.

Within a factor of a few tens of millions, you are right.

Nope, GP was right. The centre-of-mass energy in collisions of UHE cosmic rays with our atmosphere is of the order (slightly above) of the centre-of-mass energies reached at the LHC. That's another reason why we build colliders: it's hard to reach high energies in fixed-target collisions.

You'd think that after 4.5 billion years of cosmic rays hitting things like this planet, the sun, the other planets, etc. that a black hole would be here by now.

What about speed relative to the earth? A black hole produced from a cosmic particle will be produced from a stationary particle being hit, and will thus have a high momentum, easily enough to escape the earths gravity well before interacting with anything. A black hole produced at CERN will be produced from two particles travelling at nearly the same speed in opposite directions, so it will be travelling much slower. Or will it still have a high enough speed that it doesn't matter?

Don't forget that the LHC is colliding the quarks and gluons inside the protons, and the speed (momentum, you mean of course) of the incoming particles is never mathematically equal. Still, you have a valid point, this is an important difference between the LHC collisions and the comic-ray ones.

Comment: Re:Not more powerful than LHC (Score 1) 71

by Pro-feet (#43986845) Attached to: International Linear Collider Design Ready To Go
A circular one would be preferable to a linear one when your goal is to reach as high a number of collisions as possible at your target energy (as it is here), because in a circular accelerator you can store the beams instead of having to produce and dump them continuously. But unfortunately a circular collider is not possible due to the enormous synchrotron radiation at the energies aimed for, which forces you among other things to continuously pump enormous amounts of energy in your beams.

Comment: Re:Iran cut off from the Internet... (Score 1) 176

by Pro-feet (#43156931) Attached to: Iran Blocks 'Illegal' VPNs, Google, and Yahoo
Nice black-white thinking.
The people tried, at least in the cities, after the elections in 2008. Remember that uprise? Many risked (and some lost) their lives. It was not just a small minority, but it was suppressed.

I was in Esphahan just before those elections and the ordinary city people I met were in general very open, interested, longing for change.

Comment: Re:Understandable but still frustrating (Score 2) 71

by Pro-feet (#42907181) Attached to: CERN's LHC Powers Down For Two Years
This is wrong. They were shooting lead nuclei around in the past month even, and have done before.
When the LHC will come back, it will run protons again, and again lead nuclie at some more future point.
Heavy-ion collisions is something the machine was designed for.
It's the higher energy that requires the extensive repairs and upgrades, and the downtime.

"It's curtains for you, Mighty Mouse! This gun is so futuristic that even *I* don't know how it works!" -- from Ralph Bakshi's Mighty Mouse

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