Hi everyone,
I'm trying to learn using R, having the background of a theoretical physics PhD.
What I would need is some simple project to work on that provides me with a dataset and a specific goal. It doesn't really matter what the project is on as long as it gives an opportunity to learn...
Well, I thought that since we are talking of a quantum gravity related problem this was the best section, but maybe you are right.
Admins, please move if you think it's better.
We know that a free scalar field on a diff-invariant 1+1 dimensional background (i.e. bosonic string theory on the worldsheet) contributes to the central charge of the Virasoro algebra with a constant term.
Is there any examples of a 1+1d QFT that has instead a central charge contribution...
thanks, it seems to be a good solution ;)
I just checked these functions and since they contain just powers of my creation/annihilation operators they would work perfectly. Anyway tomorrow I will check in detail and I will let you know ;)
thanks again!
well, \[ A(\sigma) \] should be a \[ C^\infty \] function (all derivatives exist and are differentiable).
I don't know if the problem is really well defined mathematically, for me \[ A(\sigma) \] is a field for which I know the expansion in creation and annihilation operators. And...
Hello everyone,
I need to solve an integral, opfully extracting Fourier coefficients, and I don't have a clue.
It is just
\[
\int^{2\pi}_0 d\sigma \text{exp}{A(\sigma)}
\]
where
\[
A(\sigma) = \sum_n a_n e^{-i n \sigma }
\]
I tried to work with complex coordinates...
Well, actually there are not many gestures to include... I mean, all the inputs are quite simple, its just some sort of Palm "Graffiti". Even for Windows there is a freeware that allows to define custom gestures and associate text to them (maybe just single characters, but its the same).
As for...
hello everyone,
as a theoretical PhD student I came up (I'm sure I'm not the first ;) ) with an idea.
Many times for our work we spend a lot of time just rearranging or making substitutions in quite long equations (I think about the Virasoro algebra in this very moment :D ), something that...