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Results tagged with general-relativity
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user 24362
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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Accepted
How to make gravitational lens visualizing program?
What you are asking for is actually very complicated. However, just in case you are capable of doing the maths and the programming, there is a program which does some of what you are describing here. …
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Does the rotation of a massive body affect its $g$-field according to GR?
Yes, all gravitational effects of a rotating black hole are described by the Kerr metric.
Anything made of matter such as a planet or star will fly apart owing to centrifugal force long before it gets …
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How to make sense of a photon time and space being dilated infinitely?
The thing you are really talking about is called the null interval, and that is what gives special relativity its interesting spacetime structure, and a property called non-locality.
There is a nice c …
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Do massive objects follow geodesics in the same manner as electromagnetic waves?
The mistake that you are making is to think of geodesics as a property of spacetime alone, and that a particle or wave will mysteriously follow "them". A geodesic is a property of the spacetime toget …
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Does gravitational time dilation happen due to height or difference in the strength of the f...
Gravitational time dilation is caused purely by "resisting" the gravitational field, in other words by accelerating in order to maintain a fixed position within the potential well. There is no gravit …
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How accurately has general relativity's prediction of gravitational redshift been measured?
Fifty years, ago, the Pound-Rebka experiment demonstrated gravitational blue shift on Earth in a tower at Harvard, to an accuracy of 10%.
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When Rindler co-ordinates are drawn why are accelerated obserevers drawn in an area implying...
There is no specifically forbidden "region" in a real spacetime diagram in SR.
If you look at the accelerated world line, it starts nearly vertical, and "tilts" over as speed increases, but never gets …
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Is the speed of light constant even for an object which is accelerating?
No, as the object would be in a non-inertial frame of reference.
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Why is there a need for a strong field versus weak field model? is the weak field just a sim...
The weak field/slow speed solutions to Einstein's equations are useful for establishing the Newtonian limit, but pretty much eliminate the possibility of learning anything fun about GR!
You do not hav …
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answer
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Undefined symbol in Catalogue of Spacetimes (Kerr metric)
In the Catalogue of Spacetimes, in the Kerr metric section, under "General local tetrad", there is a cluster of four equations (strangely labeled 2.14.6a and 2.14.6b!), two of which contain the symbol …
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3
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General Relativity visualization software
For particle/light motion in 2D space, my nomination would be GROrbits
It's free and requires a JVM to run, there is also a web start version for the brave ;)
Sorry but I've never found anything ai …
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Accepted
What happens if I slowly lower a dangling object into a black hole?
There is a treatment of lowering a string through a Rindler horizon here, (which contains a brief discussion on the extent to which the approximation is representative).
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What motivated Einstein to formulate general relativity?
Einstein came up with General Relativity because he recognized that Special Relativity was not a good description of the universe (he couldn't make gravitation work sensibly within it).
He came up wit …
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The metric exterior of a massive object
Are you familiar with the Interior Schwarzschild Metric? As far as I can tell it addresses all your queries.
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Straight line motion with uniform velocity in spacetime according to General Relativity
The distance, $ds$, between two points in Euclidean space is $ds^2 = dx^2 + dy^2$ (according to Pythagoras). The "distance" $d\tau$, (proper time) between two events in Special Relativity is $d\tau^2 …
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