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Results tagged with general-relativity
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user 62726
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.
2
votes
why do x Schwarzschild radii equal time dilation effects of speed of light going y times fas...
It means that if move from far away from a black hole to a distance of $x$ Schwartzschild radii away from a black hole, the relative time dilation you experience is the same as if you instead accelera …
- 7,595
9
votes
In general relativity, how do we think of Newton's third law for gravity?
In general relativity, rather than a two objects exerting a gravitational force on each other, the two objects are both part of the stress-energy tensor. This tensor determines the shape of spacetime …
- 7,595
1
vote
What is the gravitational pull if one has as much mass above them as below them?
You can solve this through an application of Newton's law of universal gravitation, or equivalently Gauss's law for gravitation, but one simple way to see the answer to this is through an argument by …
- 7,595
4
votes
Geodesic equation proof confusing me
The step between (4) and (5) is an application of the chain rule. If you follow each of the terms carefully, you can see that
$$u^t = \frac{dt}{d\tau}$$
I think one of the reasons it's confusing is t …
- 7,595
2
votes
Accepted
Could you view yourself in high gravity situations?
When gravity is strong enough, it bends light towards the source of the gravity.
Roughly true
So if you were on a small planet and gravity were to gradually
increase, would the horizon ris …
- 7,595
16
votes
Thought Experiment - Poking a stick across a Black Hole's Event Horizon
Funnily enough, you will never get to find out what happens when you try to pull it back, because you won't live to see the stick pass through the event horizon. That's not because you will suffer so …
- 7,595
27
votes
Why can't I do this to get infinite energy?
Your guess at the solution to this paradox is correct. "Pumping energy up" to the space station, regardless of the method you choose, would require an input of at least the amount of energy you would …
- 7,595