All Questions
Tagged with time quantum-spin
5
questions
-3
votes
1
answer
79
views
Probabilistic behavior of quantum mechanics [closed]
In a hypothetical scenario, if I were to measure the quantum spin of an electron and it showed "up," and then I traveled back in time without changing the initial conditions, would measuring ...
- 15
0
votes
0
answers
32
views
How does pulse duration and shape affect the rotation of a quantum state?
If I have some quantum state $|\psi>$ and I apply a pulse to this to rotate it by 90 degrees, the model would normally assume a rectangular pulse. However, realistically, the pulse will probably ...
- 11
1
vote
0
answers
283
views
Maximum number of dimensions in string/M-theory
M-theory low energy limit is eleven-dimensional supergravity. However I understand that Itzhak Bars and others have been working in generalizations of string theories of 12, 13 and 14 dimensions with ...
- 295
1
vote
1
answer
267
views
How have the duration of the martian day changed in the past?
There is a panspermia theory which claims that life might have begun on Mars and I currently read a post that the human circadian rhythm is closer to the martian day length (about 25h) than the day ...
- 1,079
2
votes
1
answer
2k
views
Magnetism, spin and time reversal
I am somewhat confused about this topic.
It is usually explained how magnetic fields avoid break*ing* time reversal symmetry by the example of a field produced by a circulating charge current - run ...
- 61