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# Questions tagged [gravity]

Gravity is an attractive force that affects and is affected by all mass and - in general relativity - energy, pressure, and stress. Prefer newtonian-gravity or general-relativity if sensible.

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### Understanding Feynman: why gravity is not a spin-0 theory?

I'm struggeling understanding a certain paragraph in Feynman's "lectures on gravitation". It's lecture 3, why gravity cannot be a spin-0 theory. Here's the text: The rejection of spin-zero ...
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### A theoretical experiment about gravity and propulsion

An observer travels in a spherical ship drifting through space. The observer cannot 'see' anything outside the ship. At some time, the ship approaches a massive object P and describes an hyperbolic ...
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### Dilaton and scalar hair

I see that there are many papers for dilaton black hole with the scalar hair. So, what is the difference between dilaton and scalar hair of the black hole?
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### Numerical Solution for Geodesic Equations in Schwarzschild Spacetime [closed]

I am trying to numerically solve the geodesic equations in Schwarzchild spacetime with a python program. As I couldn't do it on my own, I tried to get help from Chat-gpt but even he failed too. This ...
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### Time dilation in quantum gravity

In General Relativity, time moves slower near massive objects where spacetime is curved stronger. In quantum gravity, the gravitational force is represented by the quantum field that refers to the ...
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### Astronomy Without Fusion

Let us begin with diffuse clouds of atomic hydrogen as we believe was the case in the early universe, but assume that nuclear fusion is not an existing mechanism. What would happen under the influence ...
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### Can two particles ever be in equilibrium under their mutual gravitational forces alone?

Can two particles be in equilibrium under the influence of their mutual gravitational forces alone? Obviously, if the two particles are kept at rest at a distance apart, one will exert an attractive ...
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### Do lightbeams redshift one another upon passing?

If it's true that anti-parallel light beams affect eachother gravitationally does this imply that they mutually redshift in addition to bending their paths towards one another? For example consider ...
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