All Questions
12
questions
-3
votes
2
answers
132
views
Time dilation and contradiction
Suppose we have a reference $R$ and a reference $R'$ with velocity $v \ne 0$ respect to $R$ then we know that:
$$\Delta t = \gamma \Delta t'$$
but respect to $R'$ the reference $R$ has also velocity $...
- 385
1
vote
2
answers
120
views
Time transformation term in Lorentz transformation
In the lorentz tranformation, I have got the following equation for time:
$$t' = \dfrac{t - \dfrac{ux}{c^2}}{\sqrt{1-\dfrac{u^2}{c}}}$$
The $S'$ system is moving relative to $S$ system with speed $u$, ...
- 11
1
vote
2
answers
274
views
Time and speed of light in Relativity
Time running slower near a massive object, but the speed of light does not really change near a massive object, according to Relativity - it just curves. Is not time directly related to the speed of ...
- 103
1
vote
1
answer
269
views
Does time dilation in a constant gravitational field depend on the choice of coordinates?
I am currently taking a course in general relativity and one of the homework problems for the course asks to justify the fact that time dilates in a constant gravitational field using the equivalence ...
- 1,747
0
votes
2
answers
290
views
Understanding proper-time as "evenly spaced gradations" on the worldline?
In this video series on relativity, proper-time is explained as "evenly spaced gradations" along a particle's worldline. Here is a screenshot:
Suppose I carry a clock with me that ticks at ...
- 164
0
votes
2
answers
113
views
Time (or rather, $dt$) as a Vector? [duplicate]
I want to preface this by saying that I'm by no means experienced with the field of physics, but while on my commute this morning, I started thinking:
Basically, I thought about time being a fourth ...
8
votes
3
answers
697
views
Can the Lorentz transformations be derived this way?
This approach is seeming intuitive to me as I can visualize what's going on at each step and there's not much complex math. But I'm not sure if I'm on the right track or if I'm making some mistakes. ...
- 6,355
1
vote
1
answer
821
views
Spacetime interval calculation - What am I doing wrong?
I'm calculating spacetime intervals in standard setup with frames A and B
where t = t' = 0 and x = x' = 0, and all the motion is going only in x direction.
Objects A and B move in relative velocity ...
- 111
6
votes
1
answer
311
views
Twin paradox with one twin in orbit, one in radial free-fall
Many questions on Physics SE relate to the twin paradox, but I did not find any that ask this specific question. Suppose that object A is in a circular orbit around a spherically symmetric, non-...
- 54.5k
4
votes
1
answer
794
views
Is this spacetime diagram for the twins paradox correct?
The link at question is here: http://www.einsteins-theory-of-relativity-4engineers.com/twin-paradox-graphical-solution.html
My question in specific is the loop in Jim's worldline. I know that ...
1
vote
2
answers
171
views
Synchronized Clocks in Inertial frame
Will the synchronized clocks placed in an inertial frame remain synchronized forever?
- 11
5
votes
3
answers
2k
views
Relationship between Coordinate Time and Proper Time
While I was reading Ta-Pei Cheng's book on relativity, I was unable to derive the correct relationship between coordinate time $dt$ (the book defined it as the time measured by a clock located at $r=\...
- 51