Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-relativistic expansion of Dirac equation with spherical scalar and
  vector potentials by similarity renormalization group   By following the conventional similarity renormalization group (SRG)
expansion of the Dirac equation developed in [J.-Y. Guo, Phys. Rev. C
\textbf{85}, 021302 (2012)], we work out the analytic expression of the
${1}/{M^4}$ order and verify the convergence of this method. As a step further,
the reconstituted SRG method is proposed by using the re-summation technique.
The speed of convergence of the reconstituted SRG becomes much faster than the
conventional one, and the single-particle densities with the reconstituted SRG
are also almost identical to the exact values.

30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph