Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Transformation of perturbative series into complex phases and
  elimination of secular divergences in time-dependent perturbation theory in
  quantum mechanics   The difficulty that the probabilities infinitely increase with time as time
is long enough in time-dependent perturbation theory for some quantum systems
is resolved by means of simply transforming the perturbative series into
natural exponential functions of the re-summed perturbative series. Three
exactly solvable models are taken to check our new formulation, and excellent
agreements with the exact solution are achieved.

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The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an