Tagged Questions
1
vote
1answer
82 views
Could the shadow move with faster-than-light speed? [duplicate]
If I make a huge laser with a figure for shadow in front of the laser, and I shine it on to the moon, will I see the light from the laser AND the shadow moving the same speed? (I read somewhere the ...
2
votes
1answer
57 views
Difference between vector and pseudo-scalar
In physics, a pseudo-scalar is a quantity that behaves like a scalar, except that it changes sign under a parity inversion such as improper rotations while a true scalar does not.
Can someone show me ...
0
votes
0answers
41 views
What is an example of a situation where Quantum Mechanics and Relativity do not work together? [duplicate]
I've learned special relativity in school last semester, and this semester we began learning about Quantum Mechanics, and my teacher told us that there was a Relativistic Schrodinger equation.
I was ...
6
votes
2answers
145 views
Do the energy levels of electron orbitals change relativistically?
When an electron emits a photon from changing energy levels, the frequency of the photon depends on the difference between the energy levels.
But if someone is moving with respect to the atom, the ...
1
vote
2answers
399 views
Careers in physics that are related to quantum mechanics or relativity?
Personally I learned Physics in high-school and found it very interesting, I read up a lot about physics in my free time.
Personally I am also a programmer which I think is also good when it comes to ...
0
votes
2answers
226 views
The Lorentz Transformations in the Micro-World
Two particles[or micro-observers] A and B are in relative uniform motion wrt each other in the x-x’ direction. The “observer” A decides to deduce[or interpret] the Lorentz Transformations wrt to B. ...
0
votes
0answers
103 views
Can space-like fields not commute and still forbid faster-than-light signalling? [duplicate]
Possible Duplicate:
Is microcausality necessary for no-signaling?
If we try to measure two non-commuting observables, only the earlier measurement would be valid. The later measurement ...
5
votes
4answers
784 views
Why are four-vectors needed in the Dirac equation, when there are 4 linearly independent 2D matrices?
I was taught that for the Dirac-equation to "work", you need matrices of the following form:
$Tr(\alpha^i) = 0$.
Eigenvalues +1 or -1
2 previous points together: equal number of negative and ...
8
votes
3answers
517 views
Is there a relativistic (quantum) thermodynamics?
Does a relativistic version of quantum thermodynamics exist? I.e. in a non-inertial frame of reference, can I, an external observer, calculate quantities like magnetisation within the non-inertial ...
