Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Deciphering the coalescence behavior of Coulomb-Schr\"odinger atomic
  wave functions from operator product expansion   We revisit the coalescence behavior of the atomic Schr\"odinger wave
functions from the angle of operator product expansion (OPE) within the
nonrelativistic Coulomb-Schr\"odinger effective field theory. We take the
electron-nucleus coalescence as an explicit example to demonstrate our
formalism, where the celebrated Kato's cusp condition can be easily reproduced.
An exact OPE relation is rigorously proved to all orders in perturbation
theory. Our approach can be readily extended to ascertain the multi-particle
coalescence behaviors of atomic wave functions, as well as to take relativistic
effects into account.

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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org