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Mathematical methods in classical mechanics, classical and quantum field theory, quantum mechanics, statistical mechanics, condensed matter, nuclear and atomic physics.

78 votes

The Planck constant for mathematicians

Let's give it a try. Of course, the precise mathematical meaning is perhaps absent, so the answers are sort of heuristic. But if I understand correctly, you want to gain intuition ;) The first observ …
Stefan Waldmann's user avatar
28 votes
Accepted

Quantum mechanics formalism and C*-algebras

In addition to what has already been said I would like to add some more comments. I completely understand your suspicion that the passage from unbounded operators to bounded ones is at least tricky. F …
Stefan Waldmann's user avatar
18 votes

Applications of symplectic geometry to classical mechanics

The list will be long, very long indeed. But to start: Questions about dynamics of Hamiltonian systems are at the heart of symplectic topology, symplectic capacities are precisely introduced for that …
Stefan Waldmann's user avatar
17 votes
Accepted

Can a sphere be a phase space?

Of course, the spheres are compact while cotangent bundles are noncompact (unless in dimension 0). Nevertheless, a bit more interesting is the question whether the even dimensional spheres can be phas …
Stefan Waldmann's user avatar
13 votes

Is the quantum algebra unique (up to isomorphism) in deformation quantization ?

In deformation quantization there is a full classification available: let us first focus on the symplectic case which is easier. If $(M, \omega)$ is a symplectic manifold (like the $\mathbb{R}^2$ in y …
Stefan Waldmann's user avatar
9 votes

Dimensional Analysis in Mathematics

Dimensional analysis can be viewed as the study of graded objects in algebra. The grading then corresponds to "counting the units" in a precise way. There are of course many examples and I believe tha …
Stefan Waldmann's user avatar
6 votes
Accepted

Formal series convergence in deformation quantization and $C^*$-condition

OK, let me give a try on this question. There are several problems hidden underneath which one has to address. First, for physical reasons a formal deformation is not sufficient. $\hbar$ is a constan …
Stefan Waldmann's user avatar
4 votes
Accepted

Open symplectic embeddings and deformation quantization

Hi Igor, there is a quite elementary way to see that star products restrict to open subsets: it's essentially part of the definition of a star product. Here, I will focus on the case of smooth (sympl …
Stefan Waldmann's user avatar
4 votes

Deformation quantization of a closed Riemann surface with genus >1

One should definitely take a look at the work of Bordemann, Meinrenken, and Schlichenmaier: they provide a Berezin-Toeplitz inspired deformation quantization for all compact quantizable (i.e. the Kähl …
Stefan Waldmann's user avatar
3 votes

graded generalization of the Moyal–Weyl product

Yes, it's just putting signs correctly. Martin Bordemann has a preprint from the 90s where he adapted Fedosov's construction in the graded setting. If you are only interested in the flat situation thi …
Stefan Waldmann's user avatar