Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gravitationally enhanced depolarization of ultracold neutrons in
  magnetic field gradients, and implications for neutron electric dipole moment
  measurements   Trapped ultracold neutrons (UCN) have for many years been the mainstay of
experiments to search for the electric dipole moment (EDM) of the neutron, a
critical parameter in constraining scenarios of new physics beyond the Standard
Model. Because their energies are so low, UCN preferentially populate the lower
region of their physical enclosure, and do not sample uniformly the ambient
magnetic field throughout the storage volume. This leads to a substantial
increase in the rate of depolarization, as well as to shifts in the measured
frequency of the stored neutrons. Consequences for EDM measurements are
discussed.

12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat