Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin waves and Collisional Frequency Shifts of a Trapped-Atom Clock   We excite spin-waves with spatially inhomogeneous pulses and study the
resulting frequency shifts of a chip-scale atomic clock of trapped $^{87}$Rb.
The density-dependent frequency shifts of the hyperfine transition simulate the
s-wave collisional frequency shifts of fermions, including those of optical
lattice clocks. As the spin polarizations oscillate in the trap, the frequency
shift reverses and it depends on the area of the second Ramsey pulse,
exhibiting a predicted beyond mean-field frequency shift. Numerical and
analytic models illustrate the observed behaviors.

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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex