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TimeRip496
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Why is gravity not electromagnetic radiation like attractive/repulsive force? I know the ans is related to shielding but I don't get it.
Are you saying that gravitational waves don't carry energy? This isn't correct. See e.g. Sticky bead argument and mass in general relativity!harrylin said:Moreover, radiation carries energy away (and with that mass); if gravitation was like radiation then after enough time, nothing would remain.
Ibix said:I think shielding comes into it to explain why EM forces dominate at short range but gravity dominates the long range.
I think there should be an "an" after the "not" in the OP, and no "radiation", and am answering on that basis. I could be wrong...Drakkith said:I thought they meant something else when I posted.
I think it is smth related to this which I myself don't really understand.Delta² said:Well not sure what you have in mind by shielding (we can have electrostatic shielding but there is not a known way to shield from a gravitational field if that's what u mean) but until scientists come up with the grand theory of unification that unifies all the known fields and all the known forces, gravity will be considered a different force from the electromagnetic force. The best theory that we currently have about gravity is General Relativity, while the best theory nowdays about electromagnetism is Quantum Electrodynamics.
TimeRip496 said:Such a surface cannot exist, because it would increase the area of a black hole, were it to fall in.
TimeRip496 said:the focusing property of null geodesics, which is the weak energy condition.
No. The OP asked not about gravitational waves but about gravity, which is a property of stable matter. At least locally measured that implies constant mass, if I'm not mistaken.Shyan said:Are you saying that gravitational waves don't carry energy? [..]
Gravity is a fundamental force that is responsible for the attraction between masses. It is a non-contact force that acts over long distances. Electromagnetic waves, on the other hand, are a type of energy that is carried by particles called photons. They are created by the movement of electrically charged particles and can travel through vacuum at the speed of light.
Gravity is not considered an electromagnetic wave because it does not follow the same properties and laws as electromagnetic waves. For example, gravity has an infinite range and can act through any medium, whereas electromagnetic waves have a limited range and can only travel through certain materials.
At present, there is no known way to manipulate gravity like electromagnetic waves. However, scientists are researching ways to potentially manipulate gravity through theories such as anti-gravity and the manipulation of space-time.
Gravity is detected and measured using various instruments such as gravimeters, accelerometers, and interferometers. These instruments measure the effects of gravity on objects and use mathematical equations to calculate its strength.
There is currently no evidence to suggest that gravity is affected by electromagnetic fields. However, there are theories that suggest that gravity and electromagnetism may be connected at a fundamental level, but more research is needed to fully understand this relationship.