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Old 09-10-2010, 11:47 PM #49
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Default Re: Antimatter

Time is crucial indeed, such spontaneously formed pairs cannot live longer than a plank time, so any process seperating them must act faster than that.

As for radiation emitted from black holes: It's pretty much (like) thermal radiation, and the apparent temperature decreases with the black holes mass. If its heavy enough such that the the apparent temperature is below cosmological background (3 kelvins), the black hole gains mass from cosmological background falling in faster than it loses it from hawking radiation going out.

I'm not sure on what the exact figure is, but its in the order of the mass of the moon. To get an idea on that: such a black hole would be as heavy as the moon, yet much less than 1 mm in schwarszchild radius. If there was one on earth, it would easily gobble up the solar system


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Old 09-11-2010, 12:40 AM #50
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Default Re: Antimatter

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Originally Posted by chipdouglas View Post
sorry for the going slightly off topic... but magnetism was brought up... do you think they will ever invent a 1pole magnet...meaning it is only a north pole or south pole magnet?

michael
If you go back to thinking of the little arrows inside a iron bar analogy for a magnet, with all the arrows lined up in one direction, cutting the magnet in half does not effect the direction of the field. You would have to somehow only magnetize one half of the bar, which could be slightly hard :P
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