Black Holes |
Black Holes |
Dec 7 2005, 04:04 PM
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Newbie Group: Members Posts: 8 Joined: 6-December 05 Member No.: 599 |
any one wanna talk black holes. i'm not a professional or anything. i vaguely remember hearing s. hawkin revising his opinion on it saying it wasnt a "worm hole" anymore and that it just destroys all matter and worth nothing else.
i only make my observations, childlike actually, to that of what happens on earth, and why shouldnt it happen in the rest of the universe. why should anything here (goverening law of physics, etc.) be different anywhere else? just like a tornado, or water running down a drain (or that infamous lake that was drained by accident by some guys drilling and all the water drained into the salt mine, i cant remember the name now but a 6 inch hole sucked in a tanker), why wouldnt a black hole be that "event" that punched a hole into another "dimension/galaxy whatever" with less pressure. and maybe all that "dark matter" is the "reminant" of what comes out of a black hole. i dont know, just talking. my head is always "out there, out of earth..." maryalien |
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Dec 8 2005, 01:52 PM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Mind? Of course not! That's what we do here.
By the way, I did a bit of research and got an explanation for the evaporation of black holes. It seems that there is a phenomenon known to exist in the cosmos called "vacuum fluctuations." Basically, what happens is that a pair of particles -- basically, a particle and an anti-particle, or in other words, matter and anti-matter -- can appear spontaneously in a vacuum. They immediately annihilate each other, so conservation of mass and energy is maintained. But for that instant, it is not. And it is that violation of the second law of thermodynamics that allows a black hole to evaporate. You see, over the course of billions of billions of years, such a pair of particles will appear billions of times next to the event horizon of a black hole. One of the pair will be swallowed by the black hole, and the other will radiate away from the black hole. The effect is such that the mass of the particle that escapes is actually reduced from the mass of the black hole. Over billions of billions of years, this process will reduce the mass of a black hole down to zero. But, as Richard says, that process takes many, many times longer than the cosmos has already existed. So, a vast majority of black holes haven't lost all that much mass, and it will take many billions of times longer than the Universe has already existed for most black holes to evaporate in this fashion. And since there is little data to constrain the upper or lower limits of the spontaneous particle creation/annihilation, it's hard to set an exact date by which all the black holes in the Universe will evaporate. So -- in the final analysis, it's something that happens. But it happens so slowly, relatively speaking, that we don't have to worry too much about it. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Guest_Richard Trigaux_* |
Dec 8 2005, 02:14 PM
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#3
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Guests |
QUOTE (dvandorn @ Dec 8 2005, 01:52 PM) Mind? Of course not! That's what we do here. By the way, I did a bit of research and got an explanation for the evaporation of black holes. It seems that there is a phenomenon known to exist in the cosmos called "vacuum fluctuations." .... -the other Doug Yes it is. An interesting thing is that, after many theories, very small black holes would appear at time of a very violent collision between two particles, either from cosmic rays or into particle accelerators. But such micro-black holes, being very small, disintegrate instantly. What would be interesting would be to observe this phenomenon in particule accelerators. because at the time when the micro-black hole disintegrates, all what was "inside" gets out again. So it is an unique mean to obtain information from within a black hole, and it could reply to many questions about what happen into black holes: -are the particules swallowed by the black hole still existing individually, or are-they reduced to a singularity? (mar, a singularity is not a "thing" or an object, it is a point, in the mathematical meaning of this word, where common laws are no more valid. Think to a rubber membrane that you push with a nail, without however punching through: the point at the tip of the nail has special geometrical properties, that you can discover if you try to draw lines, squares, triangles, etc... on the membrane around it). The alternative to a complete singularity would be some very compressed state of matter having in gross the diametre allowed by he Heisenberg uncertainties. (Mar, the Heisenberg uncertainties are, after quantum theory, a fundamental limit on the knowledge we can have of the position or energy of a particle. Within this domain, the particle appears as something blurred). But in this case, there would be a very small domain into the black hole with a normal physics, normal causality law and normal flow of time. -Is the physics into a black hole similar tou ours, or may a new physics appear, eventually different for each black hole? I would add that Hawking certainly has answers to all these questions, but very few people can judge of the validity of his work today, and no physical experiment can be designed to test his theories, except the one above. |
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