In the following, I provide responses to questions and statements by several conributors to this thread. Each paragraph begins with the name of the contributor to whom that paragraph is applicable. Paragraphs not introduced by a name are continuations of the previous paragraph.
moriankey: The energy consumed in creating a particle pair outside a black hole must necessarily have been borrowed temporarily from the space in which the particles appear because it cannot have passed through the event horizon to arrive there. The process must begin with production of a pair of particles OUTSIDE the black hole, one particle then falling into the black hole and the other remaining outside with enough kinetic energy to prevent it from falling into the black hole. When it first appears, it must already be moving away from the black hole fast enough to escape to infinity.o
Chas: Space will not spin. It will be twisted in the direction of rotation of the black hole by an amount determined by the mass of the black hole and its rotationial velocity. The phenomenon is called "frame dragging".
Mrs. B: "Quark soup" is the name given to the contents of the Universe immediately after quarks, mesons, electrons, and other esoteric particles, comprising a plasma, condense out of the nearly pure radiaton comprising the contents of the Universe during the first moments of the Big Bang.
Hawkinns and Thorne had a bet on whether matter could escape from a black hole. Hawkins later devised the mechanism, involving "Hawkings radiation" that explained how matter COULD escape a black hole, thereby proving himself wrong and losing the bet.
namcitsym: There is no limit to how much matter can fall into a black hole.
Maddad: A person unfortunate enough to fall into a black hole would experience no local slowing of local time, that is how fast his clock ran, as he approached and fell into the black hole. However, he would see time at locations remote from his own location speeding up faster and faster as he approached the event horizon. He'd notice nothing whatever to tell him when he passed through the event horizon. Observers outside the event horizon would never see him pass through the event horizon for it would appear them that time he was going slower and slower as he approached the event horizon. In fact, it would appear to them that he never reached the event horizon, much less passed through it.
bons212: Objects are drawn into black holes from all directions.
Evileye: The way that objects fall into black holes is more like the way comets come into the solar system than the way planets orbit the sun in roughly coplanar orbits. General relativistic frame dragging will tend to pull them into the plane of the black hole's rotation, also collisions between orbiting objects will tend to bring them into the rotational plane of the black hole.
Uranu5: "a gravitational pull = to the speed of light" is like comparing monkeys and trees. Gravitational pull is force. The speed of light is a speed, There is no way to compare force with speed. The rotation of a black hole has nothing to do with its gravitational effects although its rotation can affect its gravitational effect through general relativistic frame dragging. A black hole does not "pull in other matter from different parts of the body of the mass creating the black hole which makes the pulled in material move towards the points that are moving across the equater."
sheeny: The mechanism of evaporation from a black hole involves quantum-mechanical "tunneling". In classical mechanics, nothing can escape from a black hole. The contents of a black hole can be seen as a collection of particles in thermodynamic equilibrium, the most energetic particles falling just short of having enough energy to escape from the black hole. In quantum mechanics, particles can "borrow" energy from the vacuum but must return it after a brief time, but that time is long enough so that the borrowed energy enables them to pass throuugh the event horizon. Through this mechanism, a few photons, neutrinos, electrons,and a few more massive particles can occasionally escape from the black hole. The photons appear outside the event horizon as blackbody radiation at a temperatuure only a degree or so above absolute zero. There's also the model that you described. But the model involving tunneling seems closer to what actually happens. As you stated, evidence for the existence of Hawking radiation has yet to be found.
Last edited by dcl : 03-May-2008 at 12:52 AM.
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