Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinematical versus Dynamical Contractions of the de Sitter Lie algebras   We explicit and clarify better the contraction method that Bacry and
Levy-Leblond\cite{jmll} used to link all the kinematical Lie groups. Firstly,
we use the kinematical parameters: the speed $c$ of light, the radius $r$ of
the universe and the period $\tau$ of the universe constrained by $r=c\tau$.
Secondly, we use the dynamical parameters that are mass $m$, energy $E_0$ and
compliance $C$. The kinematical and the dynamical parameters are related by the
three relations $c^2=\frac{E_0}{m}$, $\tau^2=mC$ and $r^2=CE_0$. For each
kinematical Lie algebra, we express the associated physical quantities in
function of these dynamical parameters.

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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
3
The categories of this paper are: physics
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-ex