- #1

dschwie

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Thanks and regards.

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- Thread starter dschwie
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In summary: This means that not only massive particles, but also massless particles like photons, can contribute to the curvature of spacetime and therefore interact with other masses through gravity. This explains the phenomenon of gravitational lensing, where the path of light is bent by the curvature of spacetime caused by massive objects. In summary, gravity is a local curvature of spacetime caused by the energy and momentum of objects, including both massive and massless particles.

- #1

dschwie

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Thanks and regards.

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- #2

jtbell

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Basically, yes.dschwie said:I understand that gravity is a local curvature of spacetime and photons move through spacetime so that makes sense. Is the explanation as simple as that?

https://www.physicsforums.com/threads/why-are-massless-photons-affected-by-gravity.511173/

- #3

Buckleymanor

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So in effect could massless particles moving through space time attract each other.

- #4

DrStupid

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Buckleymanor said:So in effect could massless particles moving through space time attract each other.

Yes, an extreme example is a Geon:

https://en.wikipedia.org/wiki/Geon_(physics)

- #5

jtbell

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Yes. In general relativity, the "source" of gravity is the stress-energy tensor, whose components contain the energy and momentum of an object. Mass is only one form of energy.Buckleymanor said:would massless particles like photons moving through space make gravity.

- #6

whit3r0se-

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Energy mass equivalence, gravity can also therefore be described as a function of energy.

Gravity is a fundamental force of nature that describes the attraction between objects with mass. Massless particles, such as photons, do not have mass but they are still affected by gravity due to their energy and momentum.

Yes, even though massless particles do not have mass, they have energy and momentum which means they can still be influenced by gravitational forces.

The theory of relativity, specifically Einstein's general theory of relativity, explains that gravity is not a force between masses, but rather the curvature of spacetime caused by the presence of mass and energy. This theory also predicts the behavior of massless particles in gravitational fields.

Yes, according to the theory of relativity, massless particles are also affected by time dilation in gravitational fields. This means that time will appear to pass slower for a massless particle in a strong gravitational field compared to a massless particle in a weaker gravitational field.

No, according to the theory of relativity, the escape velocity of a black hole is greater than the speed of light. Since massless particles travel at the speed of light, they cannot escape the gravitational pull of a black hole.

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