Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ytterbium in quantum gases and atomic clocks: van der Waals interactions
  and blackbody shifts   We evaluated the C_6 coefficients of Yb-Yb and Yb -alkali/group II van der
Waals interactions with 2% uncertainty. The only existing results for such
quantities are for the Yb-Yb dimer. Our value, C_6=1929(39) a.u., is in
excellent agreement with the recent experimental determination of 1932(35) a.u.
We have also developed a new approach for the calculation of the dynamic
correction to the blackbody radiation shift. We have calculated this quantity
for the Yb 6s^2 ^1S_0 - 6s6p ^3P_0 clock transition with 3.5% uncertainty. This
reduces the fractional uncertainty due to the blackbody radiation shift in the
Yb optical clock at 300 K to 10^{-18} level.

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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: supr-con
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol