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May
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comment Angular momentum operator in terms of ladder operators
A reference to where this is treated in detail would also be much appreciated.
May
7
asked Angular momentum operator in terms of ladder operators
May
4
awarded  Enlightened
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accepted Derivation of total momentum operator QFT
May
2
comment Derivation of total momentum operator QFT
ugh.... obviously. Thanks, I could have just thought a little bit before asking the question, but sometimes its just nice to be told the answer. Thanks!
May
2
asked Derivation of total momentum operator QFT
Mar
29
comment Time Evolution of a Manifold Embedding
its from a different era, but still the best reference on Regge calculus in my opinion.
Mar
29
answered Time Evolution of a Manifold Embedding
Mar
8
accepted Analyticity and Causality in Relativity
Mar
6
comment Analyticity and Causality in Relativity
yes I think that this is along the lines of what I have concluded as well... I think that a refined interpretation of what the speaker was saying is that causality is violated if you demand that every solution is always analytic. In other words (as you say in your answer) maybe it just turns out that a solution is analytic, however if you demand that it remains analytic under some local perturbation (i.e. you change the solution a little at some point) then you will violate causality...
Mar
5
comment Analyticity and Causality in Relativity
depends on what topology you choose... I believe that the most people use the usual topology on $\mathbb{R}^n$.
Mar
4
comment Analyticity and Causality in Relativity
@Sidious Lord: just to clarify $\exp(-1/x^2)$ is smooth (i.e. infinitely differentiable) at $x =0$ but not analytic at $x=0$. Bases on your language I think this is what you meant.