"Even if the interacting fields were elements of the same algebra W for all $\lambda$ and had a common set of states, as Dyson noted more than 60 years ago, for a theory
such as the one with interaction Lagrangian $\lambda \varphi^4$, a ground state $\omega_0(\lambda)$ cannot be expected to be analytic in $\lambda$ at $\lambda = 0$, since no ground state can exist when $\lambda<0$. Thus, perturbative expressions for quantities such as the S-matrix should not converge—even if it were the case that notions of “in” and “out” particle states could be defined."
Is it possible for information (like 1 and 0s) to be transmitted faster than light?
For instance, take a rigid pole of several AU in length. Now say you have a person on each end, and one of them starts pulling and pushing on his/her end.
The person on the opposite end should receive the push...
I was reading Landau & Lifshitz's Classical Theory of Fields and I noticed that they mention that an extended rigid body isn't "relativistically correct".
For example, if you consider a rigid rod and apply a torque at one end, by definition of being rigid, the whole body must start rotating at ...
I am writing a package which I use extensively in parallel computations, and to lighten the coding load on the 'run-time' notebook, I want my package to sit on the $DistributedContexts list of sessions in which it is called.
The way I'm doing it now is to simply call
$DistributedContexts := {$C...
Beside the word physics is drawn a figure which looks like a mexican head/ sombrero. Where does it stands for and why is this used. Does it has to do something with condensations??
