Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Diffraction in time in terms of Wigner distributions and tomographic
  probabilities   Long ago appeared a discussion in quantum mechanics of the problem of opening
a completely absorbing shutter on which were impinging a stream of particles of
definite velocity. The solution of the problem was obtained in a form entirely
analogous to the optical one of diffraction by a straight edge. The argument of
the Fresnel integrals was though time dependent and thus the first part in the
title of this article. In section 1 we briefly review the original formulation
of the problem of diffraction in time. In section 2 and 3 we reformulate
respectively this problem in Wigner distributions and tomographical
probabilities. In the former case the probability in phase space is very simple
but, as it takes positive and negative values, the interpretation is ambiguous,
but it gives a classical limit that agrees entirely with our intuition. In the
latter case we can start with our initial conditions in a given reference frame
but obtain our final solution in an arbitrary frame of reference.

21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex