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Results tagged with general-relativity
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user 11176
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.
12
votes
Accepted
What is the likelihood of ever discovering the graviton?
Unfortunately, no physically reasonable detector could ever detect gravitons. For example, a detector with the mass of Jupiter placed in close orbit around a neutron star would only be expected to ob …
- 1,485
2
votes
How can we be sure about the constancy of atomic clocks as in the Hafele and Keating time di...
If the effect wasn't due to time dilation, then why would the measured results agree with predictions of relativity so well? On the 25th anniversary of the H-K experiment, the National Physical Labor …
- 1,485
3
votes
What is the equation of the gravitational potential in general relativity?
Like Jerry said, carrying over concepts from Newtonian gravity to general relativity isn't that simple. If you assume that spacetime is stationary, it is possible to define something similar to the gr …
- 1,485
3
votes
Accepted
Space Expansion vs. Relative Motion
Firstly, remember what it means for space to be expanding - it doesn't mean that space is some rubbery fabric that gets pulled, it means that the metric of space is expanding. That is, the scale fact …
- 1,485
1
vote
Event horizons are untraversable by observers far from the collapse?
It's key to remember that the observer outside of the black hole will never see you fall into the black hole. However, this observer can jump into the black hole himself, and see what happened to you …
- 1,485
14
votes
Does the speed of light vary in non-inertial frames?
The speed of light has a velocity of c in an accelerating frame of reference if you constrain yourself to making local measurements. So, the simple answer is that yes, the speed of light remains const …
- 1,485