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Results tagged with general-relativity
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user 313823
A theory that describes how matter interacts dynamically with the geometry of space and time. It was first published by Einstein in 1915 and is currently used to study the structure and evolution of the universe, as well as having practical applications like GPS.
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Maximum Density
I was wondering about what triggers black hole formation, e.g. in the core of a neutron star that gets too massive. Does the matter there have to exceed some density threshold so that the space time …
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Escaping photons from a forming black hole
The event horizon and Schwartzchild radius are exactly the same. There is no "in between."
Perhaps you are asking, "When the event horizon forms in what used to be the core of the star, what happens t …
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Accepted
Does a thing ever reach the event horizon in its own reference frame?
No, because the EH is a coordinate singularity, that only exists in the frame of an observer who is always outside the BH. To the "raindrop" observer falling into it, the EH does not exist, and the on …
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Worries about the equivalence principle
This is the same as saying that on a curved 2D surface, like that of a sphere or a paraboloid, you can draw a square. And as you shrink the size of the square, it will approach being a totally flat pl …
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Two clocks in free fall
Actually, a rocket accelerating upwards will have the tail clock ticking more slowly in the rocket's frame, but not because of the Earth. Via the equivalence principle, the rocket's large acceleration …
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How can space time be bent?
"Stretch" is just kind of an analogy. What mass and energy do is change rules of geometry in their vicinity, which govern how points in space and time are connected to each other. For instance, in …
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What would a clock read that has existed since the Big Bang?
Just what the title says.
The clock in question I am assuming to be infinitesimal in size (no spacetime curvature inside the clock). What would the proper time of a single point be at this epoch of t …
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How would portals behave with dilation of time if they existed?
The beauty of general relativity is the local behavior of any object (trajectories, time passage, distances) is always the same! I.e. an insect riding on your rock thrown through the portal (perhaps …
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Maximum density of a black hole
Modern physics does not know the answer to this. The structure of a black hole in General Relativity is based upon a pointlike singularly (or ringlike singularity for a rotating black hole). Inside t …
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Accepted
How would objects move in a linear gravitational field?
The uniform field in one direction is basically what we experience on the surface of Earth.
The illustrations you see like the rubber sheet bent by a heavy object are just trying to give you a rough c …
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Radiative Energy in a Gravity Well
It has been hypothesized that in the very far future, most or all matter will have decayed into radiation.
A planet like Earth is composed of matter, forming a gravity well based upon the total energy …
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Event Horizon Tunnel
Regarding the following short animation of a merger between a large and small black hole:
https://www.youtube.com/watch?v=Y1M-AbWIlVQ&feature=youtu.be
The colored surfaces are meant to be the horizons …
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Black hole vs Dark energy
This is a follow-up question to this answer.
The original question was whether there is a maximum size limit to a black hole in our universe. The answer given was that if the event horizon coincided …
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I know that gravitational waves are generated by accelerated masses, but do all accelerated ...
No. All masses do. But our detectors are only sensitive enough at this time to detect waves from the largest collisions (black holes, neutron stars).
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Newton's Third Law in General Relativity [duplicate]
In the Framework of Newton's laws of motion gravity is a force. Therefore when a small body falls or is deflected towards a large mass like the Earth due to the force of gravity, it is said that the …
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