Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Wigner function for the orientation state   We introduce a quantum phase space representation for the orientation state
of extended quantum objects, using the Euler angles and their conjugate momenta
as phase space coordinates. It exhibits the same properties as the standard
Wigner function and thus provides an intuitive framework for discussing quantum
effects and semiclassical approximations in the rotational motion. Examples
illustrating the viability of this quasi-probability distribution include the
phase space description of a molecular alignment effect.

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The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas