Search Results
Search type | Search syntax |
---|---|
Tags | [tag] |
Exact | "words here" |
Author |
user:1234 user:me (yours) |
Score |
score:3 (3+) score:0 (none) |
Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
Views | views:250 |
Code | code:"if (foo != bar)" |
Sections |
title:apples body:"apples oranges" |
URL | url:"*.example.com" |
Saves | in:saves |
Status |
closed:yes duplicate:no migrated:no wiki:no |
Types |
is:question is:answer |
Exclude |
-[tag] -apples |
For more details on advanced search visit our help page |
Results tagged with general-relativity
Search options not deleted
user 109928
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.
0
votes
Does all of spacetime exist?
Just to offer a counterpoint:
That the law of physics are the same for all observers is what is meant by "relativity".
Now for any given observer, the distinction between past, present and future …
1
vote
2
answers
605
views
What are world lines as opposed to arbitrary curves in spacetime?
In GR the spacetime manifold is equipped with a metric which makes it a Lorentzian manifold. It is the metric that is doing the separation of space and time (so that we end up with three dimensions of …
2
votes
A Hidden Principle in Relativity
I do not agree with the premise of the question, that is the structure of a though experiment. Here is how I would put it instead:
We present a setup as seen by an observer
We use SR or GR to derive …
2
votes
Accepted
Concept of time in General Relativity
There is no physical meaning associated to an event. An event is a point in the spacetime manifold, where the manifold itself is a mathematical structure allowing to retrieve the effect of gravity as …
2
votes
Accepted
What are details of this claim of Penrose about gravity and QFT being at odds with each other?
The relevant paper is I believe On the Gravitization of Quantum Mechanics 1: Quantum State Reduction (Penrose, 2014). This is open access.
Penrose actually talks about two types of incompatibility be …
1
vote
The Fabric of Space-time?
The spacetime of general relativity is highly dynamic. Static representations are very misleading. Static representations include the rubber sheet metaphor, which is static because the rubber sheet is …
1
vote
Does a Photon take longer to reach me when travelling in the "trough" of a gravitational Wave?
In multi-messenger astronomy it has experimentally be observed that gravitational waves and light originating from a far-away source (for example the 2017 neutron stars merger) are detected on Earth w …
11
votes
1
answer
469
views
Aren't black holes required to exist forever in our frame of reference instead of evaporating?
I know that for an observer far away, nothing ever crosses a black hole horizon (due to time dilation), while in the frame of reference of a falling observer the horizon is nothing special on its way …
4
votes
If an astronaut had stationed in International Space Station for the duration of mission, 17...
This is anwered in Gravity on the International Space Station - General Relativity perspective, where we learn that time dilation in the ISS with respect to Earth equator is 1.00000000028655.
So afte …
2
votes
The Time Freezing Room - Theoretically possible?
Unfortunately the longest elapsed time along a world line happens on a geodesic, that is when a body is at rest. So you cannot have time "accelerate", you can only "slow it down" relatively to a refer …
3
votes
Accepted
When we say energy curves spacetime, which is the cause and which is the effect?
The Einstein equations are differential equations: they state a local relationship between stress-energy-momemtum and curvature that, when solved, gives a global solution, a spacetime.
At the local …
3
votes
Why do objects "fall" along spacetime geodesic lines?
First, only a test particle "falls" along a geodesic. A test particle is an idealized object not only at rest, but which also does not itself contribute to the curvature of spacetime (no mass, no ener …
2
votes
Why is it said that, because gravity can bend light, that this entails a curvature of space-...
General relativity has not been created to explain the bending of light, which was observed years afterwards only.
And indeed, the idea of gravity having an effect on light was not absent from Newtoni …