Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on 'Anyon in External Elecromagnetic Field: Hamiltonian and
  Lagrangian Formulation'   We point out that in a recent paper by Chaichian et al. (Phys.
Rev.Lett71(1993)3405) Dirac quantization procedure is not properly followed as
a result of which the resulting quantum theory is different from what one will
get by a straightforward application of Dirac's formulation. For example at
quantum level the model in I has noncommutative geometry, i.e., $[x_\mu, x_\nu]
\neq 0$ while a correct treatment would give $[x_\mu, x_\nu] = 0$. Moreover,
their assertion about $\alpha$ being an arbitrary constant in $S_\mu = -\alpha
p_\mu /{\sqrt{p^2}} $ is not correct and consequently one can not say whether
the model describes anyons.

37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg