All Questions
Tagged with spacetime reference-frames
17
questions with no upvoted or accepted answers
4
votes
1
answer
112
views
How to relate Riemannian and Lorentzian tetrad fields on the same manifold/spacetime?
Consider Gibbons and Hawkings paper wherein a Riemannian metric $\overset{\mathcal{R}}{g}_{\mu\nu}$ and everywhere well defined normalized line field $l_{\mu}$ on spacetime $M$ may be used to ...
- 2,847
4
votes
0
answers
137
views
Construction of comoving tetrad frame
Suppose I have some system, for example the Earth orbiting the Sun.
In the Sun's rest frame we can define some basis $e_{\mu}$.
If the Earth has 4-velocity $u^{\nu}$, how would one transform to the ...
- 1,751
2
votes
0
answers
62
views
About General Relativity and Reference Frames
So, I came up with this question which is intriguing me since a bit. Maybe it's stupid, but it's always better to ask.
The question is about inertial reference frames (I'll name them IRF)
We know ...
- 3,705
2
votes
0
answers
165
views
Car parking special-relavity puzzle
Hi I read the following puzzle from an old text book long time ago. However it doesn't provide the answer. So what is the solution?
Let's suppose a car is going to park to a garage and the garage is ...
- 121
1
vote
1
answer
113
views
How to tell who is experiencing time slower and who faster when travelling at different speed?
I am trying to understand time dilation w.r.t velocity. Its said that when a satellite travels around earth (at speed more than a synchronized clock on earth which is stationary w.r.t earth), it ...
1
vote
1
answer
118
views
Reference systems in Special and General Relativity
I am enthralled by the notion of placing observers along with standard identical clocks in a line spaced from one another according to rods of standard length when place next to one another at the ...
- 11
1
vote
2
answers
77
views
Acceptable parametrizations of curved spacetime
When we parametrize an (say absolute) space we have really no restriction (other than smoothness and one value naming) on parametrization.
But I wonder on curved spacetime (also an absolute thing) ...
- 1,409
1
vote
0
answers
65
views
Are reversible and irreversible processes frame dependent?
since it is all about time. If I have a look at an irreversible process from a frame where time runs really slow. is there a possibility of considering that process reversible from that frame?
- 63
0
votes
0
answers
26
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Question on Example 5.9 of Prof. Hartle Gravity textbook
I'm reading the Gravity Hartle book (ed.2003) and I'm having trouble with the question in the last part of Example 5.9 - Frequency Measured by an Accelerating Observer. More specifically the problem ...
- 1
0
votes
0
answers
51
views
Geometric definition absolute velocity in affine spaces
currently I am reading the following paper by Halvorson and Clifton (https://arxiv.org/abs/quant-ph/0103041) where they try to argue that localizable particles are inconsistent with relativistic ...
- 21
0
votes
2
answers
104
views
Justification of string breakage in Bell's Spaceship paradox from observer's frame
In Bell's Spaceship Paradox, are there any direct observations that the stationary observer can make that would justify the breaking of the string without taking into consideration as to what's taking ...
- 166
0
votes
1
answer
57
views
Observers at rest and simultaneity
Suppose we have two observers A and B and they are at rest. Observer A observes two objects falling from height H (A has same distance between the two objects). Does observer B will measure different ...
- 1,648
0
votes
2
answers
101
views
Moving faster through space
I was reading through some articles today and I found,
$$T'=T\sqrt{1-\frac{v^2}{c^2}} $$
The faster you move through space, The slower you move through time.
What does this statement mean?
- 121
0
votes
3
answers
156
views
Schutz and spacetime diagrams
I've been struggling with understanding basic spacetime diagrams in the first chapter of Schutz's book on General Relativity. I don't get why the slope of the t prime axis of a moving observer is 1/...
0
votes
0
answers
153
views
Frame transformations in curved spacetime
Suppose I have a vector $k^{\alpha}$ in a frame A
A second frame B has a 4-velocity w.r.t frame A of $u^{\mu}$.
How would I determine the original vector in frame B, $k^{\beta}$, for a general (i.e. ...
- 1,751