# Questions tagged [probability]

For questions about probability, probability theory, probability distributions, expected values and related matters. Purely mathematical questions should be asked on Math.SE.

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### Transition dipole moment integral relation to probabilities derivation

I want to learn about selection rules and so have to understand transition dipole moment. Here is a nice text on it: https://chem.libretexts.org/Bookshelves/...
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### Probability to fall back to ground state of hydrogen atom

I would like to show mathematically that electrons always fall back to ground state when in the excited state. I think that the best way would be to find the probability. Once the excited state is ...
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### Why can't we take a limiting relative frequency over nested spheres in relativistic spacetime?

The Measure Problem of eternal inflation cosmology is to determine the correct probability measure over the theoretically infinitely many individuals (or civilizations or worlds) for self-locating ...
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### Interpretation on basic results about Momentum Probability Distribution $\|\chi (k)\|$

hope you're all doing well. There might be questions related to this topic but I couldn't stand other responses mainly because I just began learning QM. There's this problem on QM1 (Quantum Mechanics ...
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### 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, ...
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### Griffiths QM probability problem

This isn't really a homework problem, I'm making my way through this book on my own, I've read the first couple of chapters, and have now started to do the problems but have gotten stuck on this ...
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### Reconstructing field configuration from sparse data assuming a probability distribution

This question is extremely basic, so I apologise for this. Suppose we want to estimate the configuration of a field $\phi(x)$ where $x \in \Omega$, with $\Omega$ the domain. We are given the values of ...
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### Probability in classical physics

I have read lots of thing on probability in QM and the different ways of intending it. Now, I am wondering how physicists intend probability in classical physics. To be more specific, I have read some ...
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### How does one calculate the chance that an asteroid hits the Earth and what does this chance mean?

I read in this article (in "Independent"): An asteroid that is projected to come close to Earth later this year has a 0.41 percent chance of hitting the planet, according to Nasa data. The ...
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### Should we trust quantum mechanics for working of the mirrors?

In this video, it is explained that it is not necessary that photons obey the laws of reflection and each photon can take any possible path to reach the so-called black hole receiver and all the paths ...
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### What is the Majorana wavefunction in Kitaev chain?

Considering $N$ particle Kitaev chain in the topological phase, if we solve the 2N$\times$2N BdG Hamiltonian matrix,we can get zero energy eigenvalue, and two corresponding degeneracy state in the ...
When we derive the expression for particle flux/probability current, we find that it is directly proportional to the Wronskian of $\psi$ and its conjugate and deduce that it is constant when particle ...