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-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 ...
Vishnu's user avatar
  • 15
0 votes
1 answer
55 views

The probability of a circular region being "invaded" by moving spheres as a function of time

I had uploaded the same problem in maths stack exchange but since it got no answer and because I think that it is a problem that can be seen both as a physical one I considered uploading it both on ...
Kani Pen's user avatar
  • 331
0 votes
1 answer
95 views

Novikov self-consistency principle and probabilities?

According to the Novikov's self consistency principle (also proposed by other authors such as Kip S Thorne) 1 2, if an event exists that would cause a paradox or any "change" to the past, ...
vengaq's user avatar
  • 2,462
2 votes
0 answers
125 views

Time and Quantum Mechanics

my question is about the nature of time across classical/macro and quantum scales. I understand that the 2nd law of thermodynamics and entropy increase has a lot to do with our understanding of time ...
user43685's user avatar
  • 103
1 vote
2 answers
150 views

How to interpret irreversibility in time?

I'll quote Feynman's Lectures, chapter 52 (Symmetry in Physical Laws) of volume 1: [...] If we see the egg splattering on the sidewalk and the shell cracking open, and so on, then we will surely ...
fonini's user avatar
  • 113
0 votes
1 answer
174 views

How to build a clock? [closed]

You have unreliable clocks that fire in the interval $(t,t+\delta)$ with probability density $f(t;\lambda)=\lambda\exp(-\lambda x)$. How will you build the best clock using these unreliable components ...
Inspired_Blue's user avatar