Questions tagged [special-relativity]
The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.
11,132
questions
0
votes
0
answers
31
views
Lorentz transformation of Creation and Annihilation operators for a real scalar field theory - MIT OCW QFT I Problem set 3 [closed]
I have been working through the MIT OCW's QFT lecture notes and problem sets, but I have come to realize that I have a fundamental misunderstanding of what is meant by how objects transform under ...
0
votes
2
answers
80
views
is $LT$ a Lorentz invariant?
We know the relations of time dilation and length contraction
$$L=\frac{L_0}\gamma\\
T=\gamma T_0$$
If we multiply them together, we get
$$LT=L_0T_0.$$
This holds for all $L$ and $T.$
So, is $LT=L'T'$ ...
- 219
-4
votes
3
answers
85
views
Is there a situation in which two photons/particles violate Lorentz transformation?
It does not necessarily have to be a pair production or anything with a name.
Consider two photons moving away from or moving towards each other in the void. If imagining photons in relativity is ...
user366915
8
votes
1
answer
221
views
A puzzle about relativistic spin
I'm suffering from a confusion about relativistic spin. I don't believe my question has been asked before, and I'm sure I've made some silly mistake somewhere, but I can't spot it. So I'm appealing to ...
- 131
4
votes
3
answers
247
views
Meaning of general Lorentz transformations
According to Wikipedia, the Lorentz transformations for two inertial frames are written:$$\begin{cases} t'=\gamma(t-\frac{\mathbf {r}_{\parallel }.\mathbf{v}
}{c^{2}} )\;\;\;(*)\\\mathbf {r'...
- 1,400
-2
votes
0
answers
59
views
Relativity problem about light signals and rockets equipped with mirrors [closed]
I find in a relativity book a problem that states:
"A rocket with its own length $L$ moves away from Earth at a constant velocity $v$. A radar signal emitted from a ground station is reflected ...
- 1
1
vote
1
answer
134
views
Some confusion about understanding the relativistic quantum mechanics
S. Weinberg in his book "The quantum theory of fields" chapter 2 introduced the notion of symmetry in quantum mechanic as follows: Physical states are represented by rays in Hilbert space. ...
- 374
-5
votes
0
answers
82
views
Where can I publish a paper on an overhaul of quantum mechanics and relativity, for peer review? [closed]
I am working on a theory that combines quantum machanics and special relativity, the paper is by no means ready, I am just wondering where I could publish it for peer review when it is. I have never ...
- 1
2
votes
2
answers
140
views
When is the Lagrangian a Lorentz scalar?
The Lagrangian $\mathcal{L}$ can be defined as the Legendre transform (when it exists) of the Hamiltonian $\mathcal{H}$, a non-Lorentz scalar quantity (as $\mathcal{H} =T^{00}$). My questions are,
...
- 1,611
-2
votes
0
answers
49
views
Magnetic Field Generation in a Vacuum Through Special Relativity
The way special relativity explains electromagnetism is that when electrons move, their lengths contract due to relativistic effects, even though they do not move at extremely high speeds. This ...
6
votes
5
answers
4k
views
Wikipedia states that the relativistic Doppler effect is the same whether it is the source or the receiver that is stationary. Can this be true?
According to Wikipedia, the relativistic Doppler effect is simply the classical Doppler effect for a stationary source, $1-v/c$, times the relativistic time dilation, $1/\sqrt{1-v^2/c^2}$ (where v is ...
- 131
1
vote
2
answers
147
views
Resolution of Ehrenfest paradox using only special relativity
It was my understanding the solution to the Ehrenfest paradox requires non-Euclidean geometry. Observers riding the rotating disk measure small distances according to the Langevin-Landau-Lifschitz ...
- 1,900
-3
votes
0
answers
84
views
On definition of time in non-inertial frames [closed]
Strictly speaking we can only compare times and lengths in inertial frames of reference because the measuring tools are in the same conditions and aren't subject to G-force. So they are identical ...
2
votes
3
answers
462
views
Question on special relativity
I am trying to learn special relativity. If we consider two inertial reference frames with spacetime co-ordinates $(t,x,y,z)$ and $(t',x',y',z')$ and let there be 2 observers who measure the speed of ...
- 576
0
votes
0
answers
84
views
Co-ordinates and change of frame in relativity [closed]
Given an inertial co-ordinate system, and observer at the origin. I'll make it concrete, for simplicity. He sees an object at the point $x = +10$, moving at velocity $v = +1$. He's subjected to a ...
- 55