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Gara
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Okay, I'm proberly missing something very silly, but if gravity is thought to go the speed of light, how come it can escape a black hole, and light can not?
Gara said:Okay, I'm proberly missing something very silly, but if gravity is thought to go the speed of light, how come it can escape a black hole, and light can not?
selfAdjoint said:Similarly gravitation, if it is carrried by gravitons at all, is carried by virtual ones.
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yanniru said:The posts on this thread are an example of how little we understand nature. I see above at least three different answers to why gravity escapes black holes :
1. It is carried by virtual particles that travel faster than light
2. It is a residue of an objects gravity before it collapsed into a black hole
3. Static or nearly static fields just are- they need not travel
I would suggest that gravity is not at all like light. General Relativity says that the gravitational fields of massive objects determine the configuration of space, which in turn determines how light travels in it. Light is passive. And gravity is fundamental, even more fundamental than space. Mass creates gravity, and gravity creates the black hole which traps light, but not gravity. The gravitational field must exist both in and outside the black hole, just as space must.
Where did the idea that virtual particles can travel faster than light come from?selfAdjoint said:In particular virtual gravitons can move faster than light. Since it's just the speed limitation that traps real photons, the FTL virtual particles aren't trapped.
ahhhh... but the gluon is massless, my friendA massive particle such as the gluon
I disagree. I remember to have read in some Baez's page that virtual gravitons can travel faster than c. If Baez said it, it must be trueVirtual particles still obey the universal speed limit of 'c'
In section 2, the virtual photon's plane wave is seemingly created everywhere in space at once, and destroyed all at once. Therefore, the interaction can happen no matter how far the interacting particles are from each other. Quantum field theory is supposed to properly apply special relativity to quantum mechanics. Yet here we have something that, at least at first glance, isn't supposed to be possible in special relativity: the virtual photon can go from one interacting particle to the other faster than light! It turns out, if we sum up all possible momenta, that the amplitude for transmission drops as the virtual particle's final position gets further and further outside the light cone, but that's small consolation. This "superluminal" propagation had better not transmit any information if we are to retain the principle of causality.
Thank you, it is normally accepted that gluons are massless; I was using the Higgs-Kibble mechanism to give mass to gauge particles, such as the gluon, in order to explain confinement, otherwise they would have infinite range.meteor said:ahhhh... but the gluon is massless, my friend
Alright, I suppose if they are virtual and gravitons they can be made to do whatever you want, Baez did not seem convinced. Virtual gravitons are beyond observational physics.meteor said:I disagree. I remember to have read in some Baez's page that virtual gravitons can travel faster than c. If Baez said it, it must be true
A black hole is a region in space where the gravitational pull is so strong that nothing, including light, can escape from it. This makes it invisible to the naked eye and difficult to observe.
Black holes are formed when a massive star runs out of fuel and collapses under its own gravity. This causes the star to become extremely dense and compact, creating a black hole.
No, black holes do not die. They can only grow larger by consuming matter and merging with other black holes. However, they can eventually evaporate over an extremely long period of time through a process called Hawking radiation.
Black holes cannot be seen directly because they do not emit any light. However, scientists can observe the effects of a black hole on its surroundings, such as the bending of light or the disruption of nearby stars and gas, to infer its presence.
While black holes may seem scary, they are not a threat to us on Earth. The nearest black hole is thousands of light-years away, making it too far to have any impact on our daily lives. Additionally, black holes only have a strong gravitational pull within a certain distance, so unless we get too close, they pose no danger to us.