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seen Aug 25 at 20:40

Aug
26
awarded  Good Question
Aug
25
comment QM without complex numbers
This is IMHO essentially the reason Sakurai gives - I like it!
Aug
6
comment Navigating to a distant star
I meant "in the same ballpark as what you are saying", i.e. yes, star at less than 100 km/s.
Aug
6
accepted Navigating to a distant star
Aug
6
revised Navigating to a distant star
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Aug
6
comment Navigating to a distant star
In the same ballpark for reaching the star, and when I didn't reach it, it was because the star was way too fast - the simulation code was not wrong, but the parameters were definitely wrong.
Aug
6
answered Navigating to a distant star
Aug
6
revised Navigating to a distant star
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Aug
6
comment Navigating to a distant star
From? Remember - you are the captain of the spaceship and you are expected to give a specific departure direction, at least, so that you can start the journey, right? Which one?
Aug
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revised Navigating to a distant star
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Aug
6
asked Navigating to a distant star
Jul
9
awarded  Favorite Question
Jun
2
awarded  Yearling
May
17
comment Spin, orbital angular momentum and total angular momentum
John - What is Gouldsmit talking about? The electron "rotates?" For starters, I've heard it is a "point particle" which doesn't even a radius we can measure?
May
16
comment Spin, orbital angular momentum and total angular momentum
ACuriousMind - so where is the starting point then? Should we start from rotational invariance, and from that both orbital angular momentum and spin emerge via an irreducible representation of the Lorentz group? (spin being one of the spaces in the direct sum decomposition of a tensor product of spaces (I recently learned how to do that! :-))
May
16
asked Spin, orbital angular momentum and total angular momentum
May
10
accepted How to use Clebsch-Gordan coefficients for 3 particles?
May
10
accepted Calculations with angular momentum
May
10
comment How to use Clebsch-Gordan coefficients for 3 particles?
Thanks - yes, I realized that, I can get energies and degeneracies just with the sum decomposition. Very neat!
May
10
comment Calculations with angular momentum
ACuriousMind - please bear with me, as (as you know :-), I'm just a student in a QM class... I am not sure I understand your point: I thought I would just try my hand at this kind of computation with a system of 2 particles of spin 1 and 1 particle of spin 1/2. Is that somehow illegal?